Agreement of Joint Filing

Exhibit 99.1

Agreement of Joint Filing

     Pursuant to 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, the undersigned persons hereby agree to file with the Securities and Exchange Commission the Statement on Schedule 13G/A (the “Statement”) to which this Agreement is attached as an exhibit, and agree that such Statement, as so filed, is filed on behalf of each of them.

     IN WITNESS WHEREOF, the undersigned have executed this Agreement.

Dated: March 10, 2006

Camden Partners Strategic Fund III, L.P.

By: Camden Partners Strategic III, LLC, its general partner

/s/ Xxxxxx X. Xxxxxx

Name: Xxxxxx X. Xxxxxx

Title: Managing Member

Camden Partners Strategic Fund III-A, L.P.

By: Camden Partners Strategic III, LLC, its general partner

/s/ Xxxxxx X. Xxxxxx

Name: Xxxxxx X. Xxxxxx

Title: Managing Member

Camden Partners Strategic III, LLC

/s/ Xxxxxx X. Xxxxxx

Name: Xxxxxx X. Xxxxxx

Title: Managing Member

Xxxxxxx X. Berkeley

/s/ Xxxxxx X. Xxxxxx, Attorney-in-Fact

Xxxxxx X. Xxxxxx

/s/ Xxxxxx X. Xxxxxx

Xxxxxxx X. Xxxxxxxx

/s/ Xxxxxx X. Xxxxxx, Attorney-in-Fact

Xxxxx X. Xxxxxxx

/s/ Xxxxxx X. Xxxxxx, Attorney-in-Fact