var maxqty = 9999;
var minqty = 0;
function ChkQty (obj1) {  // check any qty limits on items
var qty;
  qty = obj1.quantity.value;
  if (isNaN (qty)) {
    alert ("Enter a valid number for quantity!");
    ClrQty ();            // always clear the values!
    return false;
  }
  if (qty > maxqty) {
    alert ("You cannot order more than " + maxqty + " items!");
    ClrQty ();
    return false;
  }
  if (qty < minqty) {
    alert ("You must order at least " + minqty + " items!");
    ClrQty ();
    return false;
  }
  ClrQty ();
  return true;
}

function ClrQty () {  // Clear out the limits
  maxqty = 9999;
  minqty = 0;
}