Ah, I see the problem. You are using Microsoft's Document Object Model. This works in IE 4+, Opera and Konqeuror. I have modified your code so that it should work in IE DOM friendly browsers and W3C DOM friendly browsers (such as Mozilla, Netscape and Epiphany). In actual fact you need only use the W3C DOM as this will work in IE 5+, Opera and Konqueor etc anyway, but I've left the IE DOM in cas