Form goes back to first page instead of the next page in IE 8

I have a complex multi-page pricing form that is working in all browsers except for older versions of Internet explorer. (It works correctly in IE9). The first page works fine, although in internet explorer it is very slow, the second page when you click next no matter what options you choose it shows 2 circling icons and instead of skipping to the next page it stays there and below the current form session it shows the beginning of the form again and won't go past it. I am using the form on a pretty blank page so I do not think that it is a styling issue. here is the link to the form:
http://westcoastmetalbuildingsinc.com/wp/?page_id=20
The main page its being used on it through an iframe http://westcoastmetalbuildingsinc.com/prices.php but the behavior exists on either.