Document:

<PAGE>
                                                                       Ex. 10.28

      ACKNOWLEDGEMENT LETTER FOR PARTICIPATION OF EQUITY PLEDGE AGREEMENT

SHANGHAI FOCUS MEDIA ADVERTISEMENT CO., LTD., a limited liability company
(registered address: F Room 1003, No.1027, Changning Road, Changning District,
Shanghai)(hereinafter, "PARTICIPATED PLEDGOR") and SHENZHEN BIANJIE BUILDING
ADVERTISEMENT CO., LTD. (registered address: Room 1020, A, Wangxing Square, 38
Hongli Rd., Shenzhen) (hereinafter, "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, "EQUITY PLEDGE AGREEMENT") as an independent
contract party. Participated Pledgors and Participated Target Companies pledge
the equity of the Participated Target Companies which constitute 99% of the
registered capital of the Participated Target Companies to Focus Media
Technology as the date of the Acknowledgement Letter to secure the following
contractual obligations:

1.   Contractual Obligation for the Participated Pledgeor:

(a)  Contractual Obligation under the Call Option Agreement among Focus Media
     Technology and other relevant parties dated March 28 2005 participated by
     the Pledgor pursuant to the Acknowledge Letter dated January 13 2006;

(b)  Contractual Obligation under the Shareholder's Voting Rights Proxy
     Agreement among Focus Media Technology and other relevant parties dated
     March 28 2005 participated by the Pledgor pursuant to the Acknowledge
     Letter dated January 13 2006;

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 dated January 13 2006;

(b)  Contractual Obligation under the Shareholder's Voting Rights Proxy
     Agreement participated by the Target Company pursuant to the Acknowledge
     Letter dated January 13 2006;

                                        1

<PAGE>

This Acknowledgement Letter once executed by the Participated Pledgors and
Participated Target Company, Participated Pledgors and Participated Target
Companies shall make the same undertakings and warranties with those of Pledgors
and Target Companies under the Equity Pledge Agreement, agree to perform the
obligations of Pledgors and Target Company stipulated in the Equity Pledge
Agreement, and admit the rights and obligations of Parties under the Equity
Pledge Agreement.

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

Signature by: /s/ Jason Nanchun Jiang
              --------------------------
Name: Jason Nanchun Jiang
Position: Legal Representative
Date: January 13, 2006

SHENZHEN BIANJIE BUILDING ADVERTISEMENT
CO., LTD.
(Company chop)

Signature by: /s/ Jason Nanchun Jiang
              --------------------------
Name: Jason Nanchun Jiang
Position: Legal Representative
Date: January 13, 2006

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

Signature by: /s/ Jason Nanchun Jiang
              --------------------------
Name: Jason Nanchun Jiang
Position: Legal Representative
Date: January 13, 2006

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

Signature by: /s/ Jason Nanchun Jiang
              --------------------------
Name: Jason Nanchun Jiang
Position: Legal Representative
Date: January 13, 2006

                                        2<PAGE>
                                                                       Ex. 10.29

      ACKNOWLEDGEMENT LETTER FOR PARTICIPATION OF EQUITY PLEDGE AGREEMENT

SHANGHAI FOCUS MEDIA CO., LTD. (registered address: Room A65, 28 Floor, No.369,
Jiangsu Road, Changning District, Shanghai) and SHENZHEN BIANJIE BUILDING
ADVERTISEMENT CO., LTD. (registered address: Room 1020, A, Wangxing Square, 38
Hongli Rd., Shenzhen) (hereinafter, "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, "EQUITY PLEDGE AGREEMENT") as an independent
contract party. Participated Pledgors and Participated Target Companies pledge
the equity of the Participated Target Companies which constitute 1% of the
registered capital of the Participated Target Companies to Focus Media
Technology as the date of the Acknowledgement Letter to secure the following
contractual obligations:

1.   Contractual Obligation for the Participated Pledgeor:

(a)  Contractual Obligation under the Call Option Agreement among Focus Media
     Technology and other relevant parties dated March 28 2005 participated by
     the Pledgor pursuant to the Acknowledge Letter dated January 13 2006;

(b)  Contractual Obligation under the Shareholder's Voting Rights Proxy
     Agreement among Focus Media Technology and other relevant parties dated
     March 28 2005 participated by the Pledgor pursuant to the Acknowledge
     Letter dated January 13 2006;

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 dated January 13 2006;

(b)  Contractual Obligation under the Shareholder's Voting Rights Proxy
     Agreement participated by the Target Company pursuant to the Acknowledge
     Letter dated January 13 2006;

This Acknowledgement Letter once executed by the Participated Pledgors and

                                        1

<PAGE>

Participated Target Company, Participated Pledgors and Participated Target
Companies shall make the same undertakings and warranties with those of Pledgors
and Target Companies under the Equity Pledge Agreement, agree to perform the
obligations of Pledgors and Target Company stipulated in the Equity Pledge
Agreement, and admit the rights and obligations of Parties under the Equity
Pledge Agreement.

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

Signature by: /s/ Jason Nanchun Jiang
              --------------------------
Name: Jason Nanchun Jiang
Position: Legal Representative
Date: January 13, 2006

SHENZHEN BIANJIE BUILDING ADVERTISEMENT
CO., LTD.
(Company chop)

Signature by: /s/ Jason Nanchun Jiang
              --------------------------
Name: Jason Nanchun Jiang
Position: Legal Representative
Date: January 13, 2006

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

Signature by: /s/ Jason Nanchun Jiang
              --------------------------
Name: Jason Nanchun Jiang
Position: Legal Representative
Date: January 13, 2006

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

Signature by: /s/ Jason Nanchun Jiang
              --------------------------
Name: Jason Nanchun Jiang
Position: Legal Representative
Date: January 13, 2006

                                        2<PAGE>
                                                                       Ex. 10.30

        ACKNOWLEDGEMENT LETTER FOR PARTICIPATION OF CALL OPTION AGREEMENT

SHANGHAI FOCUS MEDIA ADVERTISEMENT CO., LTD., (registered address: F Room 1003,
No. 1027, Changning Road, Changning District, Shanghai) (hereinafter the
"PARTICIPANT SHAREHOLDER"), and FUZHOU FUKESI ADVERTISEMENT CO., LTD.
(registered address: 18 Floor, Xinduhui Garden Square, 171 Northern Wuyi Rd.
Fuzhou) (hereinafter the "NEW TARGET COMPANY"), as independent party, hereby
agree to participate in the Call Option Agreement among FOCUS MEDIA TECHNOLOGY
(SHANGHAI) CO., LTD., SHANGHAI FOCUS MEDIA ADVERTISEMENT CO., LTD. and other
relevant parties (hereinafter, "CALL OPTION AGREEMENT") dated March 28 2005. The
Participant Shareholder hereby grant Focus Media Technology with an irrevocable
equity Call Option (hereinafter "CALL OPTION") in respect to 70% of the equity
share of New Target Company held by this company. Once this Acknowledgement
Letter is executed by this company, the New Target Company and the newly
increase equity share begin to be the "Target Company" and "Option Equity"
defined under the Call Option Agreement (hereinafter the "CALL OPTION
AGREEMENT") entered into between this company, Focus Media Technology and other
relevant parties dated March 28 2005; and this company immediately make the same
representations and warranties in respect to the New Target Company and relevant
equity Call Option as this company made under the Call Option Agreement in
respect to the defined Target Company and Call Option and undertake the same
obligations therein.

<PAGE>

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

Signature by: /s/ Jason Nanchun Jiang
              --------------------------
Name: Jason Nanchun Jiang
Position: Legal Representative
Date: January 13, 2006

FUZHOU FUKESI ADVERTISEMENT CO., LTD.
(Company chop)

Signature by: /s/ Jason Nanchun Jiang
              --------------------------
Name: Jason Nanchun Jiang
Position: Legal Representative
Date: January 13, 2006

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

Signature by: /s/ Jason Nanchun Jiang
              --------------------------
Name: Jason Nanchun Jiang
Position: Legal Representative
Date: January 13, 2006

                                        2<PAGE>
                                                                       Ex. 10.31

        ACKNOWLEDGEMENT LETTER FOR PARTICIPATION OF CALL OPTION AGREEMENT

SHANGHAI FOCUS MEDIA ADVERTISEMENT CO., LTD., (registered address: F Room 1003,
No.1027, Changning Road, Changning District, Shanghai) (hereinafter the
"PARTICIPANT SHAREHOLDER"), and HEFEI FUKESI ADVERTISEMENT CO., LTD. (registered
address: Room B2401, Gujin Baihua Building, 156 Shouchun Rd., Hefei)
(hereinafter the "NEW TARGET COMPANY"), as independent party, hereby agree to
participate in the Call Option Agreement among FOCUS MEDIA TECHNOLOGY (SHANGHAI)
CO., LTD., SHANGHAI FOCUS MEDIA ADVERTISEMENT CO., LTD. and other relevant
parties (hereinafter, "CALL OPTION AGREEMENT") dated March 28 2005. The
Participant Shareholder hereby grant Focus Media Technology with an irrevocable
equity Call Option (hereinafter "CALL OPTION") in respect to 90% of the equity
share of New Target Company held by this company. Once this Acknowledgement
Letter is executed by this company, the New Target Company and the newly
increase equity share begin to be the "Target Company" and "Option Equity"
defined under the Call Option Agreement (hereinafter the "CALL OPTION
AGREEMENT") entered into between this company, Focus Media Technology and other
relevant parties dated March 28 2005; and this company immediately make the same
representations and warranties in respect to the New Target Company and relevant
equity Call Option as this company made under the Call Option Agreement in
respect to the defined Target Company and Call Option and undertake the same
obligations therein.

<PAGE>

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

Signature by: /s/ Jason Nanchun Jiang
              --------------------------
Name: Jason Nanchun Jiang
Position: Legal Representative
Date: January 13, 2006

HEFEI FUKESI ADVERTISEMENT CO., LTD.
(Company chop)

Signature by: /s/ Jason Nanchun Jiang
              --------------------------
Name: Jason Nanchun Jiang
Position: Legal Representative
Date: January 13, 2006

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

Signature by: /s/ Jason Nanchun Jiang
              --------------------------
Name: Jason Nanchun Jiang
Position: Legal Representative
Date: January 13, 2006

                                        2

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