Problem with logging - cookie related

Hi,

  here the problem : I have a web hoster that don't support asp.  So All my web site is hosted at this place except for the forum that is hosted on brinkster.  I have a web site with frame.  When my users try to login to the forum by the frame, it doesn't work and I have a icon in my ie that appear.  When I click on it, I show that requests to brinkster urls were blocked.   When my users try to login to the forum pointing directly on the brinkster web site,all is ok.  Do you have idea to solve this problem? 

   Thanks.

   BIll.