'length' is null or not an object

[bw]

People with IE 6.0 cannot use the CoolMenus3 navigation on my site. They receive the following error:

Line: 444
Char: 14
Error: 'length' is null or not an object
Code: 0

The error relates to i<addr.length; in the code below:

/************
Getting folders - THANKS TO DCAGE FOR THIS FIX
*************/
function cm_checkFolder(tmp,url){
if(url.indexOf("mailto:")>-1 || url.indexOf("/")==0 || url.indexOf("http://")==0) return url
else if(this.useframes && bw.ie || bw.ns6) return url
var addr=''; var lvl=''; var off_cnt=0; var cnt=0;
if(tmp.indexOf('file:')>-1 || tmp.charAt(1)==':') addr=this.offlineUrl;
else if(tmp.indexOf('http:')>-1) addr=this.onlineUrl;
for(var i=0;i<addr.length;i++){if(addr.charAt(i)=='\/') off_cnt+=1}
for(var i=0;i<tmp.length;i++){if(tmp.charAt(i)=='\/'){ cnt+=1; if(cnt>off_cnt) lvl+='../'; }}
return lvl + url
}


Has anyone run into this issue? Any fixes that you know of? Thank you.

Best regards,
Bill