Thanks for your reply.I tried using parent.document.ecp_cart, even thats not worked for me.As per your suggestion i checked error console of firefox and i found an interesting thing that "parent.ecp_cart is undefined".I am quite confused with this, because if i use some thing like below its working.parent.index.location ="abc.asp". Where index is one of the frame in ecp_cart frameset.If parent.ecp_cart frameset cant be identified how come its able to identify parent.index. Can you please help me to understand this behaviour.Thanks in advance.