/* CHECK FORM DATA TO ENSURE FIELDS HAVE BEEN FILLED OUT. */
function checkForm() {
     errorString = "";
     if (!document.form1.first_name.value) {
          errorString = "You must enter your First Name.\n";
     }

     if (!document.form1.last_name.value) {
          errorString += "You must enter your Last Name.\n";
     }

     if (!document.form1.email.value) {
          errorString += "You must enter your Email Address.\n";
     }
     
     if (errorString != "") {
          alert(errorString);
          return false;
     } else {
         document.form1.submit();
         return true;
     }
         document.form1.submit();
         return true;
}