function qiehuan(num){
	if(num==0)
	{
		document.getElementById("menu_out").className="index_menu_main";
	}else
	{
		document.getElementById("menu_out").className="index_menu";
		for(var id = 1;id<=11;id++)
		{
			if(id==num)
			{
				document.getElementById("qh_con"+id).style.display="block";
				document.getElementById("mynav"+id).className="nav_on";

			}else
			{
				document.getElementById("qh_con"+id).style.display="none";
				document.getElementById("mynav"+id).className="nav_off";

			}
		}
	}
}