// JScript 文件

ldh={
	$:function(o){return typeof o=="string"?document.getElementById(o):o},
	$$:function (o,p){return (p==undefined?document:this.$(p)).getElementsByTagName(o)},
	on:function(o,type,fn){o.attachEvent?o.attachEvent('on'+type,function(){fn.call(o)}):o.addEventListener(type,fn,false);},
	opacity:function(who,x){
		who=this.$(who);
		if(x==undefined){
			if( !!window.ActiveXObject){
				return who.filters.alpha?(who.filters.alpha.opacity/100):1;
			}else{
				var op=who.style.opacity;
				return isNaN(op)?1:op*1;
			}
		}
		who.style.filter="alpha(opacity="+parseInt(x*100)+")";
		who.style.opacity=x;
		return this;
	},
	fadeTo:function(who,x,fn){
		who=this.$(who);
		var fm=this.opacity(who),m=1,r=Math.floor,s=2,v;
		if(fm>x){m=-1;r=Math.ceil;s=1};
		var iFx=function(){return fm=r((fm+m*0.02*s)*100)/100};
		clearInterval(who.opacityTimer);
		who.opacityTimer=setInterval(function (){
			var v=Math.max(0,Math.min(x,iFx()));
			ldh.opacity(who,v);
			if(v==x){
				fn&&fn.call(who);
				clearInterval(who.opacityTimer);
			};
		},13);return this;
	},
	fadeOut:function(who,fn){return this.fadeTo(who,0,fn)},
	fadeIn:function(who,fn){return this.fadeTo(who,1,fn)},
	move:function(who,attr,val,s,fn){
		who=this.$(who);
		var fm=parseInt(who.style[attr])||0;
		var iFx=this.fx(fm,val,s);
		clearInterval(who.moveTimer);
		who.moveTimer=setInterval(function (){
			var v=iFx();
			who.style[attr]=v+'px';
			if(v==val){
				fn&&fn.call(who);
				clearInterval(who.moveTimer);
			};
		},13);return this;
	},
	fx:function(form,to,s){
		var m=Math[form<to?'ceil':'floor'];
		return function (){return form+=m((to-form)*(s||0.13))};
	}
};
try{document.execCommand("BackgroundImageCache", false, true);}catch(e){};//for IE6
shower={
	init:function(setting){
		var ini={box:ldh.$(setting.box),tip:ldh.$(setting.tip),index:0,z:99,list:[]};
		for(var Id in ini)this[Id]=ini[Id];
		var imgs=ldh.$$('img',this.box);
		for (var i=0;i<imgs.length;++i ) {
			this.list.push(imgs[i]);
			imgs[i].style.zIndex=i;
		};
		this.tip.innerHTML=imgs[0].getAttribute('alt');
		this.hideTip();
	},
	show:function(){
		var p2=this.list[this.index++];
		if(this.index==this.list.length)this.index=0;
		ldh.opacity(p2,0);
		p2.style.zIndex=++this.z;
		ldh.fadeIn(p2,function (){
			shower.tip.innerHTML=p2.getAttribute('alt');
			ldh.move(shower.tip,'bottom',0,0.1,function (){
					setTimeout(function(){shower.hideTip()},2500);
			}).opacity(shower.tip,0.8);					
		})
	},
	hideTip:function(){
		shower.show();
		ldh.move(this.tip,'bottom',-100,0.05);
	}
}

ldh.on(window,'load',function (){
	shower.init({
		box:'fx_box',
		tip:'tip'
	});
})