function ChooseRegion() {
  var l_Obj = document.getElementById('region_list');

	  if (l_Obj != null) {
		 if (l_Obj.style.display != 'block') { 
			l_Obj.style.display = 'block'; 
		 } else {
			l_Obj.style.display = 'none'; 
		 }
	  }  
}