[jQuery] jQuery Doing Comet

Here's some code I came up with for COMET based stuff. It has ways of
dealing with memory usage!
index.html
========
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/
TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>jQuery Comet demo</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /