var t;
	function changeNav(id){
		clearTimeout(t);
		var tabs = document.getElementById("header_buttom").getElementsByTagName("li");
		for(var i=0;i<tabs.length;i++){
			tabs[i].style.display="none";
		}
		for(var j=0;j<tabs.length;j++){
			if(tabs[j].value==id){
				tabs[j].style.display="block";
			}
		}
	}
	function changeTimer(id){
		t = setTimeout("changeNav("+id+")",500);
	}
	function clearT(){
		clearTimeout(t);
	}
	function clearTT(id){
		clearTimeout(t);
		document.getElementById(id).style.color="#FF5A00";
		document.getElementById(id).style.backgroundImage="url(../images_new/nav_03.gif)";
	}
	function changeTimerT(id,navId){
		t = setTimeout("changeNav("+id+")",500);
		document.getElementById(navId).style.color="";
		document.getElementById(navId).style.backgroundImage="";
	}