Cross Browser Form submit

Seeking a form search function to be implemented on my site which submits user input to one of my affiliate advertisers API. the input will need to be captured and populated into an Iframe Constructor on my website. An example of what I am seeking can be found at http://www.realestate.msn.com. You will see on the side bar a search "Home Improvement Professionals". I have the javascript files from my advertiser , Affiliate id, entry point etc.