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

and the current code for the search ifram is

<iframe src="" 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.