var timer=null;
var last_img = null;
var org_opacity=90;
var step=10;
var ext_time=100;function fade(img,mode){
	clearTimeout(timer);
	if(typeof img != "object") return;
	if(last_img != null && img != last_img) last_img.filters.alpha.opacity=org_opacity;
	if(img.style.filter.indexOf("alpha")==-1)img.style.filter+="alpha(opacity="+org_opacity+")";
	var cur_level=img.filters.alpha.opacity;
	if(mode){
		cur_level+=step;
		if(cur_level>100)cur_level=100;
	}else{
		cur_level-=step;
		if(cur_level<org_opacity)cur_level=org_opacity;
	}
	img.filters.alpha.opacity=cur_level;
	if(cur_level!=100 && cur_level!==ext_time){
		last_img = img;
		timer=setTimeout("fade(last_img,"+mode+")",ext_time);
	}
}