Using jQuery with Seam
If you are using RichFaces with your Seam application then jQuery is already there and ready to use. The only thing to remember is to use jQuery() function to refer to jQuery rather than using $(). $() is used to refer to prototype.js functions which RichFaces uses heavily.
Below is an example you can use to test jQuery. This should pop up a box on your page.
alert("hello seam: " + jQuery(window).height());
For more information on jQuery and RichFaces check out the RichFaces Live Demo page.