Passing URL Variables To Form

Hello,

Customer's make a payment through my domain reseller.  They have certain fields that are passed in a URL that can be submitted directly into my form.  I have been able to capture some varibles, but I need to be able to modify the name of my fields such as a field called:

domainName

It appears that JotForm is creating it as 'domainname' which does not work and won't accept my variable.  I need to be able to edit these and the tags that go into my email as some of them have numbers after them.

I need a fix for this ASAP!  An URGENT response is required!

Thanks,

Larry