function fnValidate(){
        if(document.frmMain.Zipcode.value.length!=5){
            alert("Please enter a 5-digit zip code within one of the 50 states");
            document.frmMain.Zipcode.focus();
            return false;
          }
        if(document.frmMain.Zipcode.value=="")
        {
           alert("Please select a state");
           document.frmMain.State.focus();
           return false;
        }
}