var isStart=true;
var nn = 1;
var tt;

setTimeout('change_img()',500000000);

function resetPlay(){
    isStart=true;
    var e = document.getElementById("top_slider");
    var a = e.getElementsByTagName("img");
    for(i=0;i<a.length;i++){
        if(a[i].src == bPlay.src)
            a[i].src = bPause.src;
    }
}
function playorpau(e){
    if(e.src == "http://cn.yimg.com/i/cn/con/06/bu_pau.gif"){
        e.src = bPlay.src ;
        isStart = false;
    }else{
        e.src = bPause.src;
        isStart = true;
    }
}
function pre_img(){
    resetPlay();
    nn--;
    if(nn < 1) nn=6;
    setFocus(nn);
}
function next_img(){
    resetPlay();
    nn++;
    if(nn > 6) nn=1;
    setFocus(nn);
}
function change_img()
{
    if(isStart){
        nn++;
        if(nn>6) nn=1;
            setFocus(nn);
    }else{
        tt=setTimeout('change_img()',100000000000);
    }
}
function setFocus(i)
{
    if(tt) clearTimeout(tt);
    nn = i;
    selectLayer1(i);
    tt=setTimeout('change_img()',10000000000);
}
function selectLayer1(i)
{
    switch(i)
    {
        case 1:
	        document.getElementById("fnav1").style.display="block";
	        document.getElementById("enav1").style.display="none";
	        document.getElementById("snav1").style.display="none";
			
	        document.getElementById("f1").style.display="block";
	        document.getElementById("e1").style.display="none";
	        document.getElementById("s1").style.display="none";

	        break;
        case 2:
	        document.getElementById("fnav1").style.display="none";
	        document.getElementById("enav1").style.display="block";
	        document.getElementById("snav1").style.display="none";
			
	        document.getElementById("f1").style.display="none";
	        document.getElementById("e1").style.display="block";
	        document.getElementById("s1").style.display="none";

	        break;
        case 3:
	        document.getElementById("fnav1").style.display="none";
	        document.getElementById("enav1").style.display="none";
	        document.getElementById("snav1").style.display="block";
			
	        document.getElementById("f1").style.display="none";
	        document.getElementById("e1").style.display="none";
	        document.getElementById("s1").style.display="block";

	        break;
    }
}