Youtube by keywords script - need one already made

I need a Youtube script that I'll be able to put on a page and it'll pull content based on keyword (variable I specify). It needs to pull the thumbnail from Youtube and output this value into PHP so I can use it in my code. The format needs to be: <object ...> <param ...> <embed type="application/x-shockwave-flash" ...> </object> I need a script that is already pre-made. Important: it needs to pull the thumbnail from Youtube and output this value into PHP so I can use it in my code.