Small yellow pop-up messages that appear to explain the function of a button in most windows applications can be made to appear on your website. Using the 'title' tag. This is designed to be used as explanatory system for little-known acronyms. For example, the code.
<A title="What You See Is What You Get">WYSIWYG[/url]
Or you can use this in conjunction with a hyperlink like so:
<A href="http://webglobalnet.net/bytes/" title="The Best Web Developer around!!">)