Yahoo mail access through ISA 2004

We have implemented ISA 2004 in our network. We have created different policies for the different users.

In one of the policy i have given access only to some of the sites like yahoo.com and rediff.com. But while accessing Yahoo.com, Yahoo page is not opening fully and its opening with out Pictures and flash player files. Only text is opening even after logging into yahoo account.

Its working fine with out above policy applied.
Any one help me out to rectify this problem.