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 (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: February 14, 2008

	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 By: Camden Partners Strategic Manager, LLC, its          sole manager
	/s/ Xxxxxx X. Xxxxxx
	Name:	Xxxxxx X. Xxxxxx
	Title:	Managing Member

	Camden Partners Strategic Manager, 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