function onSelectCountry(comboObj){
     document.getElementById('states').style.display='none';
     document.getElementById('canadianP').style.display='none';
     if (comboObj.value=='US '){
        document.getElementById('states').style.display='block';
     }else if (comboObj.value=='CA ') {
        document.getElementById('canadianP').style.display='block';
     }
}