How to read yahoo mail on my windows mobile 5 phone using wifi - says no frame support, but ok when on 3g?

I can connect without trouble if i connect with 3g and the mail messages appear ok. but if i connect through my wifi router, although i can access the yahoo website and navigate it, when i try to open the mail i get a blank screen. is it anything to do with frames?
Answer
Use the wap version of yahoo