If you load your gravity forms into fancybox modals like I do and you want to redirect to a paypal payment page during submission read this.
You will get a fatal failure message in IE (not FF...it's smarter) unless you use the following method to specify a form "target".
Using the noconflict jquery call in the header or somewhere before form:
This will break out of the iframe modal and proceed to paypal for payment. Remember to replace _xx with your form number.
The above error doesn't occur if you are not using an iframe modal window.