Logout help needed

Hi I am developing web application using php html javascript and postgresql. I designed my web page using html frames. 1 head frame,2 centres frame,3 side frame. My problem is I have placed logout option in head frame. While user has loged in their session will be registered. Since i have placed logout in head frame its being logged out from head frame only. How i can log out from all three frames. anyone please help me Thanks Suma _________________________________________________________________ NRIs, Choose the best solution. http://creative.mediaturf.net/creatives/citibankrca/rca_msntagofline.htm With Citibank Rupee Checking Account!