Can't open any documents or files in IE

Can't open any documents or files in IE

We are currently evaluating Zoho VO.

So far any user in IE cannot open any doument, wether .doc / .html / .gif etc in any document folder (personal/shared/groups).

Firefox will at least prompt you to open or save, but considering it'll even say that on .html files and download it instead of jsut opening it is rather interesting.

The fault seems to lie with the Javascript. Even opening a page that has javascript pop-ups says Done but with Errors. Here's one of the errors:
Line:14
Char:17
Code:0
Error:Object doesn't support this property or method
URL:http://xxxxx/vo/userDesc.do?usrDocMode=yes&isGroup=true

This has been tried on multiple computers with both IE6 and IE7.

Any thoughts?