wordpress site masket url admin logon does not work error

i am masking my wordpress bloGs site with frames page, and when i try to log into the admin i get a blank page with error message.
if anybody knows the filter code, and knows how to install it please explane i am a newbe @ this thank you wordpress community.
SAL

i saw the post somewhere, but now i can not find it.
something with adding script to the funtions.php i think?