function CheckForZipCode(sender, args) 
    {
        if (document.getElementById('radIncludeLocationFilter2').checked) {
            if (document.getElementById('txtZipCode').value == "")
                args.IsValid = false;
        }
    }
    
    function CheckZipRadio()
    {                                                  
        document.getElementById('radIncludeLocationFilter2').checked = true;
    }
    
    function CheckForState(sender, args) 
    {
        if (document.getElementById('radLocationFilter1').checked) {                                                           
            if (document.getElementById('drpLocationFilter1').value == "0")
                args.IsValid = false;
        }
    }   
     
    function ResetZipTextBox() 
    {
        document.getElementById('txtZipCode').value = '';
    }