Snow effect working in E5+ and not in FF

[ostcalling]

Hi,

I copy paste the snow effect from Dynamics Drive Forums in my webpage.
This is working fine if viewed with explorer but not with firefox.

What do I have to do?

Thanks

webpage is
www.westvlaamsescootervrienden.be

Regards
Alain

[Jesdisciple]

From the Firefox Error Console (Tools > Error Console):

Error: document.getElementById("dot" + i) is null
Source File: http://users.skynet.be/osty/scootervrienden/
Line: 618

For some reason, lines 598-602 apparently have no effect, although they are running (according to Firebug).

if (i == 0) {
    document.write("<div id=\"dot"+ i +"\" style=\"POSITION: absolute; Z-INDEX: "+ i +"; VISIBILITY: visible; TOP: 15px; LEFT: 15px;\"><a href=\"http://dynamicdrive.com\"><img src='"+snowsrc+"' border=\"0\"><\/a><\/div>");
} else {
    document.write("<div id=\"dot"+ i +"\" style=\"POSITION: absolute; Z-INDEX: "+ i +"; VISIBILITY: visible; TOP: 15px; LEFT: 15px;\"><img src='"+snowsrc+"' border=\"0\"><\/div>");
}

By the way, I'm suspicious of using the same id attribute value in multiple elements. I think it should be name.