var objLastDiv;
function switchSubNav(intDivId){
 var objCurrentDiv = document.getElementById('sub_'+intDivId);
 if(objLastDiv && objLastDiv != objCurrentDiv) {
  Effect.BlindUp(objLastDiv);
 }
  if(objLastDiv && objLastDiv == '' ) {
  Effect.BlindUp(objCurrentDiv);
 }
if(objCurrentDiv.style.display == 'none') {
 Effect.BlindDown(objCurrentDiv);
} else {
 Effect.BlindUp(objLastDiv);
}
 objLastDiv = objCurrentDiv;
}