Problem with posting form data with IE

I’m creating a simple order form in Flash MX that allows the user to type in billing and shipping information as well as quantity and it displays their final total. Clicking on the submit button will then move them to a secure server where they may then input their credit card info. I am using the LoadVars method with just send with clicking the button. This is basically straight from several examples off the web.

So far I have my Flash page working the way I want it to but it seems to only work with Mozilla. Using the form in Internet Explorer returns an error. So, does anybody have a clue as to why Internet Explorer refuses to process the form while Mozilla does? Anybody run into something like this?