var $get = function (id) {
	return "string" == typeof id ? document.getElementById(id) : id;
};
function changeNav(elem1,tt)
{
	for(var i=1;i<=tt;i++){
		var obj1=$get("nav"+i);
		var obj2=$get("subnav"+i);
		obj1.className="";
		if (obj2 != null)obj2.className="hide";
	}
	var obj11=$get("nav"+elem1);
	var obj12=$get("subnav"+elem1);
	obj11.className="act";
	if (obj12 != null)obj12.className="show";
}