Javascript linked from ImageMap won't function properly - please help

[kitfox]

I have code from my shopping cart host that pops-up a javascript window over the main page when activated.
The code works fine when posted as-is onto a blank page.

However when I try to do this from an ImageMap link, it won't open the popup window and merely opens
a new tab and show the shopping cart.

Question: How can I get the javascript window to behave normally when linked from an ImageMap?
If needed I will find a way to post the code here...just ask.

Thanks in Advance.