function myFunction(){
customerID = document.getElementById("customer").value;
LastName = document.getElementById("lastname").value;
ZipCode = document.getElementById("zipcode").value;
amount = document.getElementById("amount").value;
var url = 'https://dealercollect.com/DCCore/dms/payment/digitzs/payment-online.xhtml?dmsRefNum=3030-3739-'+customerID+'-'+LastName+'-'+ZipCode+'-Website&merchantId=dealercl-driveoffau-32622512-1545180-150947753&amount='+ amount;
document.getElementById('my_frame').src = url;
document.getElementById('myForm').action = url;
document.getElementById('myForm').submit();
}