Using a MS tutorial on browser extensions, a copy of MicroAngelo 98 and the Up-bookmarklet I found at Anil Dash, I managed to add my own working 'Up Button' to the IE5 toolbar, using the same icon as the up button in regular Explorer. Very handy for traversing webserver directories.
For an instant Up Button, drag this link to your linksbar: Up
I'm still amazed at the potential speed of Java applets, after years of programming mostly in Javascript/DHTML. Here's i.am/bald #81.