function mobilecheck() {
  addr = document.forms[0].EmailAddr.value;
  if (addr.indexOf('@') < 0) {
     if (addr > 0 && addr < 9999999999) {
         document.forms[0].submit();
     } else {
         alert('Please ensure phone number is 10 digits.');
         return false;
     }
   } else { document.forms[0].submit(); }
return true;
}