Document:

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                                                                   EXHIBIT 10.82

          Equity Pledge Agreement-Participation Letter of Shanghai Perfect Media

                   ACKNOWLEDGEMENT LETTER FOR PARTICIPATION OF
                             EQUITY PLEDGE AGREEMENT

SHANGHAI FOCUS MEDIA ADVERTISEMENT CO., LTD., (registered address: Room
1003 F, No.1027, Changning Road, Changning District, Shanghai) and JIMMY WEI YU
(Identity Card Number: 310106731015081) (hereinafter the "PARTICIPATED
PLEDGOR"), and SHANGHAI PERFECT MEDIA ADVERTISING AGENCY CO., LTD. (registered
address: No. 4278 Zhennan Road, Shanghai) (hereinafter the "PARTICIPATED
TARGET Company"), hereby agree to participate in Equity Pledge Agreement dated
on March 28, 2005 between Focus Media Technology (Shanghai) Co., Ltd.
(hereinafter "FOCUS MEDIA TECHNOLOGY"), Focus Media Digital Information
Technology (Shanghai) Co, Ltd. (hereinafter "FOCUS MEDIA DIGITAL"), Shanghai
Focus Media Advertisement Co., Ltd. and other relevant parties (hereinafter the
"EQUITY PLEDGE AGREEMENT") as an independent contract party. The Participated
Pledgor and the Participated Target Company hereby agree to pledge the equity of
the Participated Target Company which constitutes 100% of the registered capital
of the Participated Target Company to Focus Media Technology as of the date of
this Acknowledgement Letter to secure the following contractual obligations:

1.   Contractual Obligation for the Participated Pledgor:

(a)  Contractual Obligation under the Call Option Agreement among Focus Media
     Technology and other relevant parties dated March 28 2005 (hereinafter the
     "CALL OPTION AGREEMENT") participated by the Pledgor pursuant to the
     Acknowledge Letter executed by the Participated Pledgor on the date May 22,
     2006; and

(b)  Contractual Obligation under the Shareholder's Voting Rights Proxy
     Agreement among Focus Media Technology and other relevant parties dated
     March 28 2005 (hereinafter the "PROXY AGREEMENT") participated by the
     Pledgor pursuant to the Acknowledge Letter executed by the Participated
     Pledgor on the date May 22, 2006.

<PAGE>

          Equity Pledge Agreement-Participation Letter of Shanghai Perfect Media

2.   Contractual Obligation for the Participated Target Company:

(a)  Contractual Obligation under the Call Option Agreement participated by the
     Target Company pursuant to the Acknowledge Letter executed by the
     Participated Target Company on the date May 22, 2006; and

(b)  Contractual Obligation under the Proxy Agreement participated by the Target
     Company pursuant to the Acknowledge Letter executed by the Participated
     Target Company on the date May 22, 2006.

This Acknowledgement Letter once executed by the Participated Pledgor and
Participated Target Company, the Participated Pledgor and the Participated
Target Company shall make the same undertakings and warranties with those of
Pledgors and Target Companies under the Equity Pledge Agreement (to the extent
that is related and applicable to Participating Shareholder and Participated
Target Company), agree to perform the obligations of Pledgors and Target
Companies stipulated in the Equity Pledge Agreement (to the extent that is
related and applicable to Participating Shareholder and Participated Target
Company), and admit the rights and obligations of Parties under the Equity
Pledge Agreement.

                   [THE REMAINDER OF THIS PAGE IS LEFT BLANK]

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          Equity Pledge Agreement-Participation Letter of Shanghai Perfect Media

                                [EXECUTION PAGE]

SHANGHAI FOCUS MEDIA ADVERISEMENT CO., LTD.
(Company chop)

Signature by:    /s/ Jason Nanchun Jiang
              -----------------------------
Name: Jason Nanchun Jiang
Position: Authorized Representative
Date: May 22, 2006

JIMMY WEI YU

Signature by:    /s/ Jason Nanchun Jiang
              -----------------------------
Date: May 22, 2006

SHANGHAI PERFECT MEDIA ADVERTISING AGENCY CO., LTD.
(Company chop)

Signature by:    /s/ Jason Nanchun Jiang
              -----------------------------
Name: Jason Nanchun Jiang
Position: Authorized Representative
Date: May 22, 2006

FOCUS MEDIA TECHNOLOGY (SHANGHAI) CO., LTD.
(Company chop)

Signature by:    /s/ Jason Nanchun Jiang
              -----------------------------
Name: Jason Nanchun Jiang
Position: Authorized Representative
Date: May 22, 2006

FOCUS MEDIA DIGITAL INFORMATION TECHNOLOGY (SHANGHAI) CO, LTD.
(Company chop)

Signature by:    /s/ Jason Nanchun Jiang
              -----------------------------
Name: Jason Nanchun Jiang
Position: Authorized Representative
Date: May 22, 2006<PAGE>
                                                                   EXHIBIT 10.83

            Call Option Agreement-Participation Letter of Shanghai Perfect Media

                   ACKNOWLEDGEMENT LETTER FOR PARTICIPATION OF
                              CALL OPTION AGREEMENT

SHANGHAI FOCUS MEDIA ADVERTISEMENT CO., LTD., (registered address: Room
1003 F, No.1027, Changning Road, Changning District, Shanghai) and JIMMY WEI YU
(Identity Card Number: 310106731015081) (hereinafter the "PARTICIPATING
SHAREHOLDER"), and SHANGHAI PERFECT MEDIA ADVERTISING AGENCY CO., LTD.
(registered address: No. 4278 Zhennan Road, Shanghai) (hereinafter the
"NEW TARGET COMPANY"), as independent party, hereby agree to participate in the
Shareholders' Voting Rights Call Option Agreement among Focus Media Technology
(Shanghai) Co., Ltd. (hereinafter "FOCUS MEDIA TECHNOLOGY"), Shanghai Focus
Media Advertisement Co., Ltd. and other relevant parties (hereinafter the "CALL
OPTION AGREEMENT") dated March 28 2005. Participating Shareholder hereby grant
Focus Media Technology with an irrevocable equity Call Option (hereinafter "CALL
OPTION") in respect to 90% and 10% of the equity share of New Target Company
(hereinafter "NEWLY INCREASED EQUITY SHARE") respectively held by Participating
Shareholder. Once this Acknowledgement Letter is executed by Participating
Shareholder and New Target Company, New Target Company and the Newly Increased
Equity Share shall be deemed to be the "Target Company" and "Option Equity"
defined under the Call Option Agreement, and Participating Shareholder and New
Target Company shall be deemed to have made the same undertakings and warranties
related to New Target Company and Option Equity with those of the Shareholders
and Target Companies under the Call Option Agreement have made related to
"Target Company" and "Option Equity" (to the extent that is related and
applicable to Participating Shareholder and Participated Target Company), and
acknowledged and agreed to respectively perform the same obligations in the Call
Option Agreement (to the extent that is related and applicable to Participating
Shareholder and Participated Target Company).

<PAGE>

            Call Option Agreement-Participation Letter of Shanghai Perfect Media

                                [EXECUTION PAGE]

SHANGHAI FOCUS MEDIA ADVERISEMENT CO., LTD.
(Company chop)

Signature by:    /s/ Jason Nanchun Jiang
              -----------------------------
Name: Jason Nanchun Jiang
Position: Authorized Representative
Date: May 22, 2006

JIMMY WEI YU

Signature by:    /s/ Jason Nanchun Jiang
              -----------------------------
Date: May 22, 2006

SHANGHAI PERFECT MEDIA ADVERTISING AGENCY CO., LTD.
(Company chop)

Signature by:    /s/ Jason Nanchun Jiang
              -----------------------------
Name: Jason Nanchun Jiang
Position: Authorized Representative
Date: May 22, 2006

FOCUS MEDIA TECHNOLOGY (SHANGHAI) CO., LTD.
(Company chop)

Signature by:    /s/ Jason Nanchun Jiang
              -----------------------------
Name: Jason Nanchun Jiang
Position: Authorized Representative
Date: May 22, 2006<PAGE>
                                                                   EXHIBIT 10.84

                       Shareholder's Voting Rights Proxy Agreement-Participation
                                                Letter of Shanghai Perfect Media

                   ACKNOWLEDGEMENT LETTER FOR PARTICIPATION OF
                   SHAREHOLDERS' VOTING RIGHTS PROXY AGREEMENT

SHANGHAI FOCUS MEDIA ADVERTISEMENT CO., LTD., (registered address: Room
1003 F, No.1027, Changning Road, Changning District, Shanghai) and JIMMY WEI YU
(Identity Card Number: 310106731015081) (hereinafter the "PARTICIPATING
SHAREHOLDER"), and SHANGHAI PERFECT MEDIA ADVERTISING AGENCY CO., LTD.
(registered address: No. 4278 Zhennan Road, Shanghai) (hereinafter the
"PARTICIPATED TARGET COMPANY"), as independent party, hereby agree to
participate in the Shareholders' Voting Rights Proxy Agreement among Focus Media
Technology (Shanghai) Co., Ltd. (hereinafter "FOCUS MEDIA TECHNOLOGY"), Shanghai
Focus Media Advertisement Co., Ltd. and other relevant parties (hereinafter the
"PROXY AGREEMENT") dated March 28 2005. Participating Shareholder and
Participated Target Company agree to entrust the Trustees designated by Focus
Media Technology to exercise the voting rights in Participated Target Company in
respect of 100% of the equity interest in the registered capital of Participated
Target Company held by the Participating Shareholder as of the date of this
Acknowledgement Letter, on behalf of Participating Shareholder.

Once this Acknowledgement Letter is executed by the Participating Shareholder
and Participated Target Company, Participating Shareholder and Participated
Target Company shall be deemed to have made the same undertakings and warranties
with those of the Shareholders and Target Companies under the Proxy Agreement
(to the extent that is related and applicable to Participating Shareholder and
Participated Target Company), agreed to respectively perform the obligations of
the Shareholders and Target Companies stipulated in the Proxy Agreement (to the
extent that is related and applicable to Participating Shareholder and
Participated Target Company), and acknowledged the rights and obligations of the
Parties under the Proxy Agreement.

<PAGE>

                       Shareholder's Voting Rights Proxy Agreement-Participation
                                                Letter of Shanghai Perfect Media

                                [EXECUTION PAGE]

SHANGHAI FOCUS MEDIA ADVERISEMENT CO., LTD.
(Company chop)

Signature by:    /s/ Jason Nanchun Jiang
              -----------------------------
Name: Jason Nanchun Jiang
Position: Authorized Representative
Date: May 22, 2006

JIMMY WEI YU

Signature by:    /s/ Jason Nanchun Jiang
              -----------------------------
Date: May 22, 2006

SHANGHAI PERFECT MEDIA ADVERTISING AGENCY CO., LTD.
(Company chop)

Signature by:    /s/ Jason Nanchun Jiang
              -----------------------------
Name: Jason Nanchun Jiang
Position: Authorized Representative
Date: May 22, 2006

FOCUS MEDIA TECHNOLOGY (SHANGHAI) CO., LTD.
(Company chop)

Signature by:    /s/ Jason Nanchun Jiang
              -----------------------------
Name: Jason Nanchun Jiang
Position: Authorized Representative
Date: May 22, 2006

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