Javascript question...
 

I want to put a transparent GIF over an entire page in a DIV layer so that people can't click, and when they mouseover the page, it disappears.

I was thinking you could randomize the filename of the GIF to become a single use key, and then call back to the server that it was indeed that filename that the mouseover detected.

Is the logic in this sound? I want to prevent the layer from being easily circumvented.

Sounds like you should look into using a modal dialog. It could be setup to prevent the user from clicking and you could also setup an onmouseover event to close the dialog.

http://w3resources.com/top-7-modal-d...pt-comparison/

That is basically what I want, but it needs to be secure, so that someone would have to be very determined to script a way of circumventing it.