//ͷͼÇл»start
var num;
num=0;
setTimeout('change_img()',5000);
function change_img(){
if(num>=4) num=0;
setTimeout('setFocus('+num+')',5000);
num++;
tt=setTimeout('change_img()',5000);
} 
function setFocus(id)
{
	var layers=[document.getElementById("Focus1"),document.getElementById("Focus2"),document.getElementById("Focus3"),document.getElementById("Focus4")];
	var layernavs=[document.getElementById("Focusnav1"),document.getElementById("Focusnav2"),document.getElementById("Focusnav3"),document.getElementById("Focusnav4")];
	for(var i=0;i<layers.length;i++)
	{
		if(i==id){
			layernavs[i].className="tpageactive";
			layers[i].style.display="block";
		}
		else{
			layernavs[i].className="";
			layers[i].style.display="none";
		}
	}
}
//ͷͼÇл»end