I am able to add to the cart with no problem in FF/Chrome. When I open it in IE and click add, I get a javscript error of 'type' is null or not an object Line: 924 on formvalidate.js. I am using <asp:Panel ID="pnlShoppingCart" runat="server"> instead of the ajax portion. I have useajaxaddtocart set to true/yes because I want the button to add it to the cart but I don't want the drop-down to open up. Any ideas?