function validateInt()
   {
      var o = document.frmInput.txtInput;
      switch (isInteger(o.value))
      {
         case true:
            alert(o.value + " is an integer")
            break;
         case false:
            alert(o.value + " is not an integer")
      }
   }

function validateRange()
   {
      var s = document.frmInput.txtInput.value;
      var A = document.frmInput.txtA.value;
      var B = document.frmInput.txtB.value;

      switch (isIntegerInRange(s, A, B))
      {
         case true:
            alert(s + " is in range from " + A + " to " + B)
            break;
         case false:
            alert(s + " is not in range from " + A + " to " + B)
      }
   }

// isIntegerInRange (STRING s, INTEGER a, INTEGER b)
function isIntegerInRange (s, a, b)
   {   if (isEmpty(s))
         if (isIntegerInRange.arguments.length == 1) return false;
         else return (isIntegerInRange.arguments[1] == true);

      // Catch non-integer strings to avoid creating a NaN below,
      // which isn't available on JavaScript 1.0 for Windows.
      if (!isInteger(s, false)) return false;

      // Now, explicitly change the type to integer via parseInt
      // so that the comparison code below will work both on
      // JavaScript 1.2 (which typechecks in equality comparisons)
      // and JavaScript 1.1 and before (which doesn't).
      var num = parseInt (s);
      return ((num >= a) && (num <= b));
   }

function isInteger (s)
   {
      var i;

      if (isEmpty(s))
      if (isInteger.arguments.length == 1) return 0;
      else return (isInteger.arguments[1] == true);

      for (i = 0; i < s.length; i++)
      {
         var c = s.charAt(i);

         if (!isDigit(c)) return false;
      }

      return true;
   }

function isEmpty(s)
   {
      return ((s == null) || (s.length == 0))
   }

function isDigit (c)
   {
      return ((c >= "0") && (c <= "9"))
   }