function checkparameter() {

    if (document.cash_card_form.CashCardNo.value.length == 0)
    {
        alert("Please enter a CashCardŽ number.");
        return false;
    }

    if (document.cash_card_form.CashCardNo.value.length < 16)
    {
        alert("CashCardŽ number entered is less than 16 digits.");
        return false;
    }


    var string = document.cash_card_form.CashCardNo.value;
    for (var i=0;i < string.length;i++)
    {
        if ((string.substring(i,i+1) < '0') || (string.substring(i,i+1) > '9'))
        {
            alert("No characters allowed for CashCardŽ number.");
            document.cash_card_form.CashCardNo.value="";
            document.cash_card_form.CashCardNo.focus();
            return false;
        }
    }



  var can_bin = string.substring(0,4);



    if (!checkCANBIN(can_bin))
    {
        alert("Invalid CashCardŽ number!");
        document.cash_card_form.CashCardNo.value="";
        document.cash_card_form.CashCardNo.focus();
        return false;
    }

   // document.cash_card_form.action="http://176.175.7.25/cashcard/cashcardExpired.jsp";
   // document.cash_card_form.submit();
    return true;

}

function checkCANBIN(cardbin)
{
    var canbinArray = new Array("1111");

    for (i = 0; i<canbinArray.length; i++)
    {
        if (cardbin == canbinArray[i])
          return true;

    }
    return false;


}