Need a script that will display a certain image based on the current page URL

This seems like it would be an easy thing to do, but I may be wrong-

I need a script that will change what image displays within a div (or td) based on the current page URL. For example, if the page URL is www.homepage.com&clientid=1, image 1 would appear in the div or td...if the page URL is www.homepage.com&clientid=2, image 2 would appear instead, and so on. If the URL is simply www.homepage.com, a default image would appear in the div/td.

I've been looking all over for this, it seems like it would be something already written a hundred times- I'm not a coder, but am comfortable implementing code. If anyone has seen this kind of script or uses it, I would really appreciate the help!

Thanks-

do you have php on your server?

The server supports asp and embedded javascript- this is for an ecommerce site being hosted on the ecommerce solution provider's servers.

sorry i'm not very good with asp. maybe someone with better knowledge on the subject could help you out.