function playImg(obj){
	obj = document.getElementById(obj);
	var imgs = obj.getElementsByTagName("img");
	var len = imgs.length;
	var i = 0;
	var n = 0;
	var step = 0.02;
	imgs[i].style.display = "block";
	var isie = !!document.all;
	var setOpacity = function(obj,n){
		isie ? obj.style.filter = "alpha(opacity="+n*100+")": obj.style.opacity=n;
	}
	var goNext = function(){
		imgs[i].style.display = "none";
		i++;
		if(i>=len) i=0;
		imgs[i].style.display = "block";
		step = 0.02;
		setOpacity(imgs[i], step);
	}		
/*
	if (!obj.filters.revealTrans){
		obj.style.filter = "revealTrans(Duration=1.5,Transition=4);";
	}
	var tranNum = 6;
	var durNum = 1.5;
*/
	var show = function (){
		/*
		obj.filters.revealTrans.Duration = durNum;
		obj.filters.revealTrans.Transition = tranNum;
		obj.filters.revealTrans.apply();
		obj.filters.revealTrans.play();
		*/
		n += step;
		setOpacity(imgs[i], n);
		if(n>=1) step=-0.02;
		if(n<=0) goNext();
	}
	var timer = window.setInterval(show, 50);
}