I am not able to reproduce the problem using IE8 or IE7, Fire Fox, Chrome or safari.
I have tested on a couple of different computers and do not get any javascript errors on the page you link to,
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.