function val(field) {
  var reg1 = /[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ]|\!|\~|\`|\@|\#|\$|\%|\^|\&|\*|\(|\)|\-|\_|\=|\+|\\|\/|\{|\}|\[|\]|\;|\:|\'|\"|\,|\<|\>|\?|\./;
  if(field.value < 0){
    field.focus();
    alert("Please enter a valid Quantity.");
    return false;
  }else{
    if(reg1.test(field.value)){
      field.focus();
      alert("Numbers are the only valid characters for the Quantity.");
      return false;
    } //END IF
  } //END IF
  return true;
} //END FUNCTION