So I ran into this recently. Basically jquery plugin Validation doesn’t work in IE8. I found other issues with this problem and they even had problems with IE7. In my case it was just IE8. So I searched the net and found this site. Which basically said if I used the mini version of validation, it would work. And guess what? IT DID! Yea! For those of you having this problem just use the minified version and that should get you up and running.