I made one for my site, but only people with Firefox and Google Chrome can see it. If you want one at the bottom of your site, add this to your Style Sheet (CSS):
Code
#bottomBanner {background: url('URL OF YOUR TOOLBAR BG') center repeat;display: block;position: fixed;bottom: 0px;left: 50%;margin: 0 0 0 -456px;width: 912px;z-index: 999;height:34;}
Then add this to your bottom part of your website:
Code
<div id="bottomBanner" align="center">
CONTENT HERE
</div>
Here's what mine looks like: