function $_(objName){
	return document.getElementById(objName);
}


function ShowSub(id_num,num){ //舌签功能
	var menu_num = 4;
	var menu = "main";
	var list = "menu_";
	for(var i = 0;i < menu_num;i++){
		if($(menu + id_num + i)){$(menu + id_num + i).style.display = 'none';}
		if($(list + id_num + i)){(num != 3 && i == 3)?$(list + id_num + i).className='menu4':$(list + id_num + i).className='menu2';}
	}
	if($(menu + id_num + num)){$(menu + id_num + num).style.display = 'block';}
	if($(list + id_num + num)){num == 3?$(list + id_num + num).className='menu3':$(list + id_num + num).className = 'menu1';}
}