well the scenario is like this... in my 3rd frame, the user is tasked to login.I check the validity of the users login in the server-side script using vbscript/asp.the checking happens when the page is submitted.when login is valid,I need to change the source file of frame2.
I only know how to target a frame using the <a> tag's target property,but i don't know how to change the source file of another frame in the server-side.