<script language="JavaScript">
<!--
   function isPositiveInteger(val) {

    var integerCharacters = "0123456789";

    for (n = 0; n < val.length; n++) {
     if (integerCharacters.indexOf(val.charAt(n)) == -1) {
      return false;
     }
    }

    return true;
   }

   function validateForm() {

    var Form = document.confirmation;
    var errorMessage = document.getElementById("lblErrorMessage");
    errorMessage.style.display = "hidden";

    // Make sure the user entered a value for age
    if (Form.age.value.length == 0) {
     errorMessage.innerHTML = "Please enter a value for your age";
     errorMessage.style.display = "inline";
     return false;
    }

    // Make sure the age value is an integer (i.e., no lettes, dashes, commas, etc.)
    if (!isPositiveInteger(Form.age.value)) {
     errorMessage.innerHTML = "Please enter a positive integer value";
     errorMessage.style.display = "inline";
     return false;
    }

    // Make sure the value is within a range we can store
    if (Form.age.value < 1 || Form.age.value > 255) {
     errorMessage.innerHTML = "Please enter an age between 1 and 255";
     errorMessage.style.display = "inline";
     return false;
    }

    return true;
   }
-->
 </script>