**Exhibit4.13**

**AdditionClosing Addendum No. 1 to Share Purchase Agreement**

This Addendum (the “**Addendum**”) is entered into as of December24, 2006, by and among Radview Software Ltd., an Israeli corporation, corporateregistration number 51-162795-2 (the “**Company**”)and Fortissimo Capital Fund GP, L.P. on behalf of the several partnerships inwhich it serves as the general partner, (the “**Investor**”),as an addendum to that certain Share Purchase Agreement entered into by andamong the Company and the Investors (as therein defined, and for the purpose ofthis Addendum, the “SPA Investors”) on April 4, 2006 (the “**SPA**”).

W I T N E S S E T H:

WHEREAS, the Company and theSPA Investors entered into the SPA under which, inter alia, at the FirstClosing: (i) the SPA Investors purchased from the Company 25,000,000 AcquiredShares**,** at a purchase price ofUS$0.03 per share and for an aggregate purchase price of US$750,000, and (ii)the Company issued to the SPA Investors 18,750,000 Warrants, exercisable into18,750,000 Warrant Shares, for an exercise price of US$0.04 per Warrant Share;and

WHEREAS, pursuant to section3 of the SPA, during a period ending 18 months following the First Closing,each SPA Investor may, at its sole discretion, invest, in one or moreinvestment transactions additional amounts, amounting in the aggregate, for allSPA Investors, to a total of US $2,250,000; and

WHEREAS, the Investor wishesto make an additional investment in the Company under the terms and conditionsset forth in the SPA, and has, in accordance with Section 3.1 of the SPA, setthe amount of the Additional Purchase Price at $700,000; and

WHEREAS, in considerationfor the Additional Purchase Price, the Company is to issue to the InvestorAdditional Acquired Shares and Additional Warrants to purchase AdditionalWarrant Shares;

NOW, THEREFORE, inconsideration of the mutual promises and covenants set forth herein, theparties hereby agree as follows:

**1.****                        ****INTERPRETATION;DEFINITIONS**

1.1                      The Recitals and Schedules hereto constitutean integral part hereof.

1.2                      The headings of the sections and subsections of this Agreement are forconvenience of reference only and are not to be considered in construing thisAgreement.

1.3                      Capitalized terms used herein and not otherwise defined shall have themeaning as set forth in the SPA.

**2.****                        ****SALEOF ADDITIONAL SHARES**

2.1                     At the Additional Closing, the Company shall issue and allot to theInvestor, and the Investor shall purchase from the Company that number of theCompany’s Additional Acquired Shares, set opposite the Investor’s name in the **Amended Schedule A**, at a purchase priceof US $0.03 per share.

2.2                     In addition to the Additional AcquiredShares, at the Additional Closing, the Company shall issue to the Investor thatnumber of Additional Warrants to purchase additional Warrant Shares, setopposite the Investor’s name in the **Amended  Schedule A**, at an exerciseprice of US$0.04 per Additional Warrant Share. The Additional Warrants shall be in the form attached as **Schedule 5.2.1(c)**to the SPA.

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2.3                   The Company hereby represents and warrants that the Additional AcquiredShares and the Additional Warrants shall be, when issued in accordance with theterms and conditions of the SPA and this Addendum, duly authorized, validlyissued, fully paid, non-assessable, and free of any preemptive right, thirdparty rights and Encumbrances.

**3.****                        ****THEADDITIONAL CLOSING**

Thetransactions contemplated herein shall take place on November __, 2006 (the “**Additional Closing**”), to be held at theoffices of Amit, Pollak, Matalon & Co., NYP Tower 19th Floor, 17 YitzhakSade St., Tel Aviv, Israel, or at such other date, time and place as theparties shall have mutually agreed to.

### 3.1                                 At the Additional Closing, the followingtransactions shall occur simultaneously:

### 3.1.1                     The following documents shall have beenprovided to the Investor:

### (a)          Validly issued share certificates for theAdditional Acquired Shares in the name of the Investor, together with signednotices to the Registrar of Companies regarding the Additional Acquired Shares;and

### (b)         The Additional Warrants, duly executed by theCompany and issued to the Investor, in the amounts set forth in the AmendedSchedule A;

### 3.1.2                     The Investor shall pay to the Company itsproportional share of the Additional Purchase Price as set next to its name inthe **Amended Schedule A**, by way of a bank transfer to the Company’saccount, pursuant to wiring instructions given in writing by the Company priorto the Additional Closing.

**4.****                        ****NEWOPTIONS**

4.1**                      **In consideration of Fortissimo acceleratingeach Additional Closing, the Company will use its best efforts to obtainshareholder approval at its next shareholder meeting in order to approve thegrant of a new option (the “**New Option**”)to Fortissimo that will provide to Fortissimo an option to acquire the identicalamount of shares and warrants at the same terms as were available to Fortissimoat each Additional Closing.

4.2                       In the event that the grant of a New Optionis approved by the shareholders of the Company, the Company shall have theability to acquire the Additional Shares and the Additional Warrants that wereissued to Fortissimo at each Additional Closing with respect to which a NewOption was granted, at the same price at which such securities were acquiredplus 8% interest per annum for a period of twelve months from the date the newOption was issued.

**5.****                        ****OTHERPROVISIONS**

5.1                     Each of the parties hereto hereby representsthat this Addendum constitutes the valid, binding and enforceable obligation ofsuch party and that execution, delivery and performance of the obligations ofsuch party hereunder have been duly authorized by all necessary corporateactions.

5.2                     Other than as explicitly provided herein,nothing herein shall be deemed to amend or derogate in any manner from theterms and provisions of the SPA and the Schedules thereto, which shall remainin full force and effect.

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**IN WITNESSWHEREOF**, each of theparties has signed this Addendum as of the date first written hereinabove.
| **Radview Software Ltd** | ** ** | **Fortissimo Capital Fund GP LP.**              |
|--------------------------|------------|-------------------------------------------------|
| ** **               | ** ** | **By: Fortissimo Capital (GP) Management Fund** |
| **By:**                  | ** ** | ** **                                      | ** ** | **Ltd, its general partner** |
| ** **               | ** ** | ** **                                      |
| **Name:**                | ** ** | ** **                                      | ** ** | **By:** | ** ** | ** ** |
| ** **               | ** ** | **Name: Yuval Cohen**                           |
| **Title:**               | ** ** | ** **                                      | ** ** | **Title: Director** |
|                          |            |                                                 |  |  |  |  |  |  |  |

 

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**AmendedSchedule A**
| Name of Investor               | ** ** | **Address**                        | ** ** | **Portion of  Purchase Price  in US$** | ** **     | **Number of  Acquired  Shares** | ** **     | **Number of  Warrants** | ** **     | **Portion of  Additional  Purchase  Price in US$** | ** ** | **Number of  Additional  Acquired  Shares** | ** ** | **Number of  Additional  Warrants** | ** ** |
|------------------------------------------|------------|------------------------------------|------------|-------------------------------------------------------|----------------|--------------------------------------|----------------|------------------------------|----------------|-------------------------------------------------------------------|------------|--------------------------------------------------|------------|------------------------------------------|------------|
| Fortissimo  Capital Fund, LP             |       | c/o Marc Lesnick                   |       | $                                                     | 20,063.18      |                                 | 668,773        |                         | 501,580        |                                                              | $          | 24,968                                           |       | 832,267                                  |       | 624,200 |   |
|                                          |       | Fortissimo Capital Management Ltd. |       |                                                  |           |                                 |           |                         |           |                                                              |       |                                             |       |                                     |       |
|                           |       |                     |       |                                        |           |                       |           |               |           |                                                    |       |                                   |       |                           |       |
|                                          |       | 14 Hamelacha Street                |       |                                                  |           |                                 |           |                         |           |                                                              |       |                                             |       |                                     |       |
|                                          |       | Park Afek, Rosh Haayin 48091       |       |                                                  |           |                                 |           |                         |           |                                                              |       |                                             |       |                                     |       |
|                                          |       | Fax: +972-3-9157411                |       |                                                  |           |                                 |           |                         |           |                                                              |       |                                             |       |                                     |       |
|                                     |       |                               |       |                                                  |           |                                 |           |                         |           |                                                              |       |                                             |       |                                     |       |
| Fortissimo  Capital Fund (Israel), LP    |       | c/o Marc Lesnick                   |       | $                                                     | 506,090.49     |                                 | 16,869,681     |                         | 12,652,261     |                                                              | $          | 629,801                                          |       | 20,993,367                               |       | 15,745,025 |   |
|                                     |       | Fortissimo Capital Management Ltd. |       |                                                  |           |                                 |           |                         |           |                                                              |       |                                             |       |                                     |       |
|                           |       |                     |       |                                        |           |                       |           |               |           |                                                    |       |                                   |       |                           |       |
|                                          |       | 14 Hamelacha Street                |       |                                                  |           |                                 |           |                         |           |                                                              |       |                                             |       |                                     |       |
|                                          |       | Park Afek, Rosh Haayin 48091       |       |                                                  |           |                                 |           |                         |           |                                                              |       |                                             |       |                                     |       |
|                                          |       | Fax: +972-3-9157411                |       |                                                  |           |                                 |           |                         |           |                                                              |       |                                             |       |                                     |       |
|                                     |       |                               |       |                                                  |           |                                 |           |                         |           |                                                              |       |                                             |       |                                     |       |
| Fortissimo  Capital Fund (Israel-DP), LP |       | c/o Marc Lesnick                   |       | $                                                     | 36,346.34      |                                 | 1,211,545      |                         | 908,659        |                                                              | $          | 45,231                                           |       | 1,507,700                                |       | 1,130,775 |   |
|                                     |       | Fortissimo Capital Management Ltd. |       |                                                  |           |                                 |           |                         |           |                                                              |       |                                             |       |                                     |       |
|                           |       |                     |       |                                        |           |                       |           |               |           |                                                    |       |                                   |       |                           |       |
|                                          |       | 14 Hamelacha Street                |       |                                                  |           |                                 |           |                         |           |                                                              |       |                                             |       |                                     |       |
|                                          |       | Park Afek, Rosh Haayin 48091       |       |                                                  |           |                                 |           |                         |           |                                                              |       |                                             |       |                                     |       |
|                                          |       | Fax: +972-3-9157411                |       |                                                  |           |                                 |           |                         |           |                                                              |       |                                             |       |                                     |       |
|                                     |       |                               |       |                                                  |           |                                 |           |                         |           |                                                              |       |                                             |       |                                     |       |
| Yehuda  Zisapel                          |       | 24 Raoul Wallnberg Street          |       | $                                                     | 125,000.00     |                                 | 4,166,667      |                         | 3,125,000      |                                                              | $          | 0                                                |       | 0                                        |       | 0 |   |
|                                          |       | Tel-Aviv 69719, Israel             |       |                                                  |           |                                 |           |                         |           |                                                              |       |                                             |       |                                     |       |
|                                          |       | Fax: +972-3-6440639                |       |                                                  |           |                                 |           |                         |           |                                                              |       |                                             |       |                                     |       |
|                           |       |                     |       |                                        |           |                       |           |               |           |                                                    |       |                                   |       |                           |       |
|                                          |       | Cc: Yael Langer, Adv.              |       |                                                  |           |                                 |           |                         |           |                                                              |       |                                             |       |                                     |       |
|                                          |       | RAD Bynet Group Legal Department   |       |                                                  |           |                                 |           |                         |           |                                                              |       |                                             |       |                                     |       |
|                           |       |                     |       |                                        |           |                       |           |               |           |                                                    |       |                                   |       |                           |       |
|                                          |       | 24 Raoul Wallenberg St.            |       |                                                  |           |                                 |           |                         |           |                                                              |       |                                             |       |                                     |       |
|                                          |       | Tel-Aviv 69719, Israel             |       |                                                  |           |                                 |           |                         |           |                                                              |       |                                             |       |                                     |       |
|                                          |       | Fax: +972-3-6498248                |       |                                                  |           |                                 |           |                         |           |                                                              |       |                                             |       |                                     |       |
|                                     |       |                               |       |                                                  |           |                                 |           |                         |           |                                                              |       |                                             |       |                                     |       |
| Shem  Basum Ltd.                         |       | C/o Shai Beilis                    |       | $                                                     | 50,000.00      |                                 | 1,666,667      |                         | 1,250,000      |                                                              | $          | 0                                                |       | 0                                        |       | 0 |   |
|                                          |       | 8 Hanna Senesh St.                 |       |                                                  |           |                                 |           |                         |           |                                                              |       |                                             |       |                                     |       |
|                                          |       | Kfar Saba                          |       |                                                  |           |                                 |           |                         |           |                                                              |       |                                             |       |                                     |       |
|                                          |       | Fax: +972-9-960-1818               |       |                                                  |           |                                 |           |                         |           |                                                              |       |                                             |       |                                     |       |
|                                          |       | E-mail: shai@FormulaVentures.com   |       |                                                  |           |                                 |           |                         |           |                                                              |       |                                             |       |                                     |       |
|                                     |       |                               |       |                                                  |           |                                 |           |                         |           |                                                              |       |                                             |       |                                     |       |
| Michael  Chill                           |       | 210 West 89th Street          |       | $                                                     | 12,500.00      |                                 | 416,667        |                         | 312,500        |                                                              | $          | 0                                                |       | 0                                        |       | 0 |   |
|                                          |       | Apt. 4-N, New York NY 10024        |       |                                                  |           |                                 |           |                         |           |                                                              |       |                                             |       |                                     |       |
|                                          |       | Email: mchill@paramountbio.com     |       |                                                  |           |                                 |           |                         |           |                                                              |       |                                             |       |                                     |       |
|                                          |       | Phone: 212-554-4211                |       |                                                  |           |                                 |           |                         |           |                                                              |       |                                             |       |                                     |       |
|                                          |       | Cell: 646-245-2457                 |       |                                                  |           |                                 |           |                         |           |                                                              |       |                                             |       |                                     |       |
|                                     |       |                               |       |                                                  |           |                                 |           |                         |           |                                                              |       |                                             |       |                                     |       |
|                                          |       | **Total**                          | ** ** | **$**                                                 | **750,000.00** | ** **                           | **25,000,000** | ** **                   | **18,750,000** | ** **                                                        | **$**      | **700,000**                                      | ** ** | **23,333,334**                           | ** ** | **17,500,000** | ** ** |

 

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