IE9 and Mootools Validation Problems

I'm having a problem with validation when viewing in IE9. I've tried to force the browser headers to IE8. I don't have jQuery installed. Joomla 2.58 with the latest Chronoforms release. Validation works fine in other browsers. IE9 doesn't validate any of the form!

I get the dreaded "Unable to se value of the property 'className': object is null or undefined when I try to add custom js:
window.addEvent('domready', function() {
document.all.case_ready.addClass("validate['required']");
formCheck_PickUpRequest.register($('case_ready'));
});

http://www.nakanishidentallab.com/schedule-pick-up.html

Any suggestions would be GREATLY appreciated!!!

Found the problem. When using the plugin, you CAN NOT have paragraph tags around the plugin code!
Good Code:
{chronoforms}myform{/chronoforms}

Bad Code:
<p>{chronoforms}myform{/chronoforms}</p>

This seems like a bug within Chronoforms plugin. AARRRRRGGGGHHHH!! What a waste of time this has caused.

Hi tadosborn,

It's a feature of HTML, IE and the rich text editors. The HTML specs say that <form> tags are not permitted inside <p>tags; IE enforces this rule, most other browsers don't. The <p> tags are added by the rich text editor trying to be helpful.

Please see this FAQ for the problem and fix.

Bob