cookie is returning null in IE7 but working fine in netscape

[bmptech]

Hi
I am having a project to migrate from netscape to msie7.
Some things which work with netscape are not working in ie7.
When I put alert for cookie its showing some value in ie but showing
null in netscape.
I am using navigation frames in ie.
Whether getcookie/setcookie doesnt work with navigation frames in ie.
Please help.