This is a remote java script test page. This page has an image that rolls over. You need to have a javascript capable browser to get this stuff to work. This is a typical page from dreamweaver with a mouseover.
Click on "view", then "source" and look at the top of the page. Have a look at the section of the coding between the head tag that looks like this:
<script language="JavaScript" src="rollover.js"></script>
This is the section that has changed the coding from bunches of crap to a single line of coding. This is the advantage of turning your javascript into a remote file as there isn't as much clutter at the start of the page. In turn, this means that the page is more friendly for search engines to spider and crawl. Hence that means the spider's will be able to index and crawl the site a lot easier than trying to decode all the scripting crap.