function swap_tab(n){
	for(var i=1;i<=3;i++){
		var curC=document.getElementById("tab_"+i);
		var curB=document.getElementById("tab_t"+i);
		if(n==i){
			curC.style.display="block";
			curB.className="normal";
			curB.style.background="url(images/zx2.gif)";
		}else{
			curC.style.display="none";
			curB.className="active";
			curB.style.background="url(images/zx1.gif)";
		}
	}
}

function zz(n){
	for(var i=1;i<=3;i++){
		var curC=document.getElementById("t_"+i);
		var curB=document.getElementById("t_t"+i);
		if(n==i){
			curC.style.display="block";
			curB.className="normal";
			curB.style.background="url(images/zx2.gif)";
		}else{
			curC.style.display="none";
			curB.className="active";
			curB.style.background="url(images/zx1.gif)";
		}
	}
}

function daohang(n){
	for(var i=1;i<=7;i++){
		var curC=document.getElementById("dh_"+i);
		var curB=document.getElementById("dh_t"+i);
		if(n==i){
			curC.style.display="block";
			curB.className="dhnormal";
		}else{
			curC.style.display="none";
			curB.className="dhactive";
		}
	}
}

function secBoard(n)
{ 
var main=document.getElementById("main");
//var m=main.childNodes.length;
//alert(m);
    for(i=0;i<main.childNodes.length;i++)
    main.childNodes[i].style.display="none";
   main.childNodes[n].style.display="block";
}