Keyword search

Hello,

I have created a JavaScript search engine and want to add some sites. I usually go to a search engine, enter a keyword and copy the search string. After this I replace the keyword with " (I don't know if there is an easier way).

Often this works ok, but sometimes it doesn't.

When I search for "WinZip" on Download.com I see the following:
http://www.download.com/PC/Result/TitleList/1,2,0-a-0-0-e-1,00.html?st.dl.fd.qs.results

And if I search for "Doom" on HappyPuppy.com:
http://www.happypuppy.com/search/index.html

Don't these sites allow third-party pages (like mine) to use their search engines? Or is there a way?

Thanks