var curIndex=0;
	//时间间隔 单位毫秒
	var timeInterval=4000;
	var arr=new Array();
	
	
	setInterval(changeImg,timeInterval);
	
	function changeImg(){
		var obj=document.getElementById("obj");
		arr[0]=document.getElementById("arr1").value;
		arr[1]=document.getElementById("arr2").value;
		if (curIndex==arr.length-1){
			curIndex=0;
		}else{
			curIndex+=1;
		}
		obj.src=arr[curIndex];
	}