I've found a couple of sites on Google with scripts that look like they'll work.

http://www.htmlgoodies.com/beyond/ja...le.php/3458851 seems to be the best bet.

Have fun with it! I'll try things with my own site later on in the day, see if it will work.

EDIT: Here's the Google page http://www.google.co.uk/search?q=cop...vascript&hl=en