// JavaScript Document


function IsNumeric(sText)

{
   var ValidChars = "0123456789.";
   var IsNumber=true;
   var Char;

 
   for (i = 0; i < sText.length && IsNumber == true; i++) 
      { 
      Char = sText.charAt(i); 
      if (ValidChars.indexOf(Char) == -1) 
         {
         IsNumber = false;
         }
      }
   return IsNumber;
   
   }




function ValidateForm(contactform)
{
 
   if (!IsNumeric(contactform.cc.value)) 
   { 
      alert('Please enter only numbers Last 4 of Credit Card 	 field') 
      contactform.cc.focus(); 
      return false; 
      } 
 
return true;
 
}