JOINT FILING AGREEMENT

EXHIBIT 99.1

JOINT FILING AGREEMENT

The undersigned acknowledge and agree that the foregoing statement on Schedule 13D is filed on behalf of each of the undersigned and that all subsequent amendments to this statement on Schedule 13D may be filed on behalf of each of the undersigned without the necessity of filing additional joint filing agreements. The undersigned acknowledge that each shall be responsible for the timely filing of such amendments, and for the completeness and accuracy of the information concerning him or it contained herein and therein, but shall not be responsible for the completeness and accuracy of the information concerning the others, except to the extent that he or it knows or has reason to believe that such information is inaccurate.

Dated: August 23, 2010

		MAGNETAR FINANCIAL LLC
		By: Magnetar Capital Partners LP, its Sole Member
		By:		/s/ Xxxx X. Xxxxxxxx
				Name:		Xxxx X. Xxxxxxxx
				Title:		Manager of Supernova
						Management LLC, the
						General Partner of Magnetar
						Capital Partners LP
		MAGNETAR CAPITAL PARTNERS LP
		By:		/s/ Xxxx X. Xxxxxxxx
				Name:		Xxxx X. Xxxxxxxx
				Title:		Manager of Supernova
						Management LLC, the
						General Partner of Magnetar
						Capital Partners LP
		SUPERNOVA MANAGEMENT LLC
		By:		/s/ Xxxx X. Xxxxxxxx
				Name:		Xxxx X. Xxxxxxxx
				Title:		Manager
		/s/ Xxxx X. Xxxxxxxx
		Xxxx X. Xxxxxxxx