function ChangeDisplay(strName,total_num){
	var objDiv = eval(document.all.item(strName));
	var total_num = parseInt(total_num)

	if ( objDiv.style.display=="none") {
		for(i=1;i<total_num+1;i++){
			var objDiv2 = eval(document.all.item("left_menu_"+i));
			objDiv2.style.display ="none";
		}
	   objDiv.style.display ="block";
	}else{
		for(i=1;i<total_num+1;i++){
			var objDiv2 = eval(document.all.item("left_menu_"+i));
			objDiv2.style.display ="none";
		}
	  objDiv.style.display ="none";
	}
   
 }