function showTopMenu(id){
	var a = document.getElementById("topMenu").getElementsByTagName("a");
	for(var i=0;i<a.length;i++){
		if(a[i].id == id){
			if(a[i].id == "home"){
				a[i].className = "menu_left_current";
			}
			else{
				a[i].className = "menu_item_current";
			}
		} 
		else{
			if(a[i].id == "home"){
				a[i].className = "menu_left";
			}
			else{
				if(a[i].id.length>0){
					a[i].className = "menu_item";
				}
			}
		}
	}
} 

function topMenuMouseOver(id){
	if(document.getElementById(id).className!="menu_item_current"){
		document.getElementById(id).className="menu_item_active";
	}
}

function topMenuMouseOut(id){
	if(document.getElementById(id).className!="menu_item_current"){
		document.getElementById(id).className="menu_item";
	}
}

function showNavMenu(id1,id2){
	var div_link1 = document.getElementById(id1);
	div_link1.className="nav_link1_current";
	var img_link1 = div_link1.getElementsByTagName("img");
	if(img_link1.length>0){
		if(id2==""){
			img_link1[0].src="/images/arrow.gif";
		}
		else{
			img_link1[0].src="/images/arrow1.gif";
		}		
	}
	var div_sublink = document.getElementById(id1+"1");
	if(div_sublink!=null){
		div_sublink.style.display="block";
	}

	if(id2!=""){
		var div_link2 = document.getElementById(id2);
		div_link2.className="nav_link2_current";
	}
}

function show_link2(item){
	//显示或隐藏当前菜单项的二级菜单
	var id1 = document.getElementById(item.id+"1");
	if(id1.style.display=="none"){
		id1.style.display="block";
		var img_link1 = item.getElementsByTagName("img");
		if(img_link1.length>0){
			img_link1[0].src="/images/arrow1.gif";
		}
	}
	else{
		id1.style.display="none";
		var img_link1 = item.getElementsByTagName("img");
		if(img_link1.length>0){
			img_link1[0].src="/images/arrow.gif";
		}
	}
	//清除掉其它菜单项的二级菜单
	var divs = document.getElementById("content_nav").getElementsByTagName("div");
	for(var i=0;i<divs.length;i++){
		if(divs[i].className == "nav_link2_show" && divs[i]!=id1){
			if(divs[i].style.display!="none"){
				divs[i].style.display = "none";
				var oldId = divs[i].id.substr(0,divs[i].id.length-1);
				var old_Img_link = document.getElementById(oldId).getElementsByTagName("img");
				if(old_Img_link.length>0){
					old_Img_link[0].src="/images/arrow.gif";
				}
			}
		}
	}
}