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