So I am trying to rebuild a clients website. and he has a awkward search integrated for his companies inventory. I am trying to modify the search which is inlayed via iframe.

What I want to happen is for certain options to be automatically selected. Like when the screen loads it automatically select radiators. Would that be possible?

The page url is

http://riversidetruckparts.com/parts.html


and the current code for the search ifram is

<iframe src="http://search5041.used-auto-parts.biz/inventory/retail.htm" width="825" height="900" frameborder="0" scrolling="auto">

I have seen javascript be used to make changes but not much. Any idea would be welcome.