var curIndex=0;
//时间间隔 单位毫秒
var timeInterval=5000;
var arr=new Array();
arr[0]="/includes/templates/roman/images/f1.jpg";
arr[1]="/includes/templates/roman/images/f2.jpg";
arr[2]="/includes/templates/roman/images/f3.jpg";
var arrh=new Array();
arrh[0]="/includes/templates/roman/images/_f1.jpg";
arrh[1]="/includes/templates/roman/images/_f2.jpg";
arrh[2]="/includes/templates/roman/images/_f3.jpg";
setInterval(changeImg,timeInterval);
function changeImg()
{
    var obj=document.getElementById("obj");
	var objhref = document.getElementById("objhref");
    if (curIndex==arr.length-1) 
    {
        curIndex=0;
    }
    else
    {
       curIndex+=1;
    }
    obj.src=arr[curIndex];
	objhref.href=arrh[curIndex];
}