This tip can be modified and used in many different ways. When working in framesets you can sometimes want to know what frame a user was in when they selected a hotspot. Here's how to find out.
Code
You've got a frameset containing two frames, A + B. When giving the frame source append the following to the URL:
'&&FrameA' without quotes for the URL for frame A, and
'&&FrameB' without quotes for the URL for frame B.
You can now test using Javascript the document.referrer, substring the right 6 characters, and it will equal either FrameA or FrameB.
This can modified to work in many differrent situations.
Hope you like it and find it of benefit.