IE7 Errors

The following HTML code is embedded in two separate websites and neither will display the form properly in IE7. Works great in Firefox2.

<iframe height="2311px" width="100%" name="zohoform66" frameborder="0" scrolling="no" src="http://creator.zoho.com/showForm.do?formLinkId=66&link=true&sharedBy=jjwhite"></iframe>

All my other forms work great on the sites, just not this one.

Any ideas why?