last url visited

I was wondering if I should use PHP or Javascript to find out the last url visited. I need this for some security that i am building. if so, how?

Thanks
Steve:thumbsup:

either way relying on the HTTP_REFERER is never secure, I would suggest using PHP sessions to track the progress of a user through a site, i.e. if a user needs to have gone to pageA before viewing pageB then you can set a session variable on pageA and check for its existance and time created on pageB which is pretty hard to spoof.