AddThis

AddThis toolbar is not working with prototype javascript framework on IE7

Hi Guys,

My website is http://www.tvsn.com.au. I have put a AddThis toolbar on the product page, e.g. https://www.itvsn.com.au/include/oecgi2.php/product?product=125856&category=72014

The AddThis is working properly on Firefox, Chrome, IE8, but not IE7.
When I investigated the issue, I found when I remove prototype.js (which is prototype JS framework), it works. But when I put prototype back, the error comes up, saying:
Message: Object doesn't support this property or method
Line: 2
Char: 65425
Code: 0
URI: https://s7.addthis.com/static/r07/core001.js

I remember it was working fine on IE7. But, this morning, I found it doesn't work on IE7.

Can you please help me? Thank you very much.

William