STOP PRESS: There is now a new version, based on Mootools.
[ 10th October 2005: Updated again to add Safari support. Many thanks to Luis Torrefranca, Jamie Butler and Matt Kurpiewski (http://www.law.pitt.edu) and Shawn Parker & John Pennypacker (http://www.fuzzycoconut.com) for their help. ]
A bug in my upload multiple files with a single file element script was pointed out by ‘neal’ (it was possible for it to create more than one element with the same name). I’ve now fixed it, so if you downloaded it before 2nd October then please do so again — it’s here.
I’ve added an example HTML file too, so I hope it should now be a simple matter to get it working in your own pages.