function $(element){
if(arguments.length>1){
   for(var i=0,elements=[],length=arguments.length;i<length;i++)
    elements.push($(arguments[i]));
   return elements;
}
if(typeof element=="string")
   return document.getElementById(element);
else
   return element;
}
Function.prototype.bind=function(object){
var method=this;
return function(){
   method.apply(object,arguments);
}
}
var Class={
create:function(){
   return function(){
    this.initialize.apply(this,arguments);
   }
}
}
Object.extend=function(destination,resource){
for(var property in resource){
   destination[property]=resource[property]; 
}
return destination;
}
//对联广告类
var float_ad=Class.create();
float_ad.prototype={
initialize:function(id,content,top,left,width){
   document.write('<div id='+id+' style="position:absolute;">'+content+'</div>');
   this.id=$(id);
   this.top=top;
   if(!!left){
    this.id.style.left="8px"; 
   }else{
    this.id.style.left=(document.documentElement.clientWidth-width-8)+"px";
    window.onresize=function(){
     this.id.style.left=(document.documentElement.clientWidth-width-8)+"px";
    }.bind(this);
   }
   this.id.style.top=top+"px";
  
   this.interId=setInterval(this.scroll.bind(this),20);
},
scroll:function(){
   this.stmnStartPoint = parseInt(this.id.style.top, 10);
   this.stmnEndPoint =document.documentElement.scrollTop+ this.top;
   if(navigator.userAgent.indexOf("Chrome")>0){
    this.stmnEndPoint=document.body.scrollTop+this.top; 
   }
   if ( this.stmnStartPoint != this.stmnEndPoint ) {
     this.stmnScrollAmount = Math.ceil( Math.abs( this.stmnEndPoint - this.stmnStartPoint ) / 15 );
     this.id.style.top = parseInt(this.id.style.top, 10) + ( ( this.stmnEndPoint<this.stmnStartPoint ) ? -this.stmnScrollAmount : this.stmnScrollAmount )+"px";
   }
}
}
//漂浮广告类
var move_ad=Class.create();
move_ad.prototype={
initialize:function(imgOption,initPosition,delay){
   this.imgOptions=Object.extend({url:"",link:"",alt:"",width:120,height:120},imgOption||{});
   this.adPosition=Object.extend({left:40,top:120},initPosition||{});
   this.delay =delay;
   this.step = 1;
   this.herizonFlag=true;
   this.verticleFlag=true;
   this.id="ad_move_sg";
   allwidth=this.imgOptions.width+16;
   var vHtmlString="<div id='"+this.id+"' style='position:absolute; left:"+this.adPosition.left+"px; top:"+this.adPosition.top+"px; width:"+allwidth+"px;";
   vHtmlString+=" height:"+this.imgOptions.height+"px; z-index:100;'><a href='"+this.imgOptions.link+"' target='_blank' title='"+this.imgOptions.alt+"'><img src='"+this.imgOptions.url+"' width='"+this.imgOptions.width+"' height='"+this.imgOptions.height+"' style='border:none;' alt='"+this.imgOptions.alt+"' /></a></div>";
   document.write(vHtmlString);
   this.id=$(this.id);
   this.intervalId=setInterval(this.scroll.bind(this),this.delay);
   this.id.onmouseover=this.stop.bind(this);
   this.id.onmouseout=this.start.bind(this);
},
scroll:function(){
   var L=T=0;
   var B=document.documentElement.clientHeight-this.id.offsetHeight;
   var R=document.documentElement.clientWidth-this.id.offsetWidth;
   this.id.style.left=this.adPosition.left+document.documentElement.scrollLeft+"px";
   this.id.style.top=this.adPosition.top+document.documentElement.scrollTop+"px";
   this.adPosition.left =this.adPosition.left + this.step*(this.herizonFlag?1:-1); 
   if (this.adPosition.left < L) { this.herizonFlag = true; this.adPosition.left = L;} 
   if (this.adPosition.left > R){ this.herizonFlag = false; this.adPosition.left = R;} 
   this.adPosition.top =this.adPosition.top + this.step*(this.verticleFlag?1:-1); 
   if(this.adPosition.top <= T){ this.verticleFlag=true; this.adPosition.top=T;}
   if(this.adPosition.top >= B){ this.verticleFlag=false; this.adPosition.top=B; }
},
stop:function(){
   clearInterval(this.intervalId); 
},
start:function(){
   this.intervalId=setInterval(this.scroll.bind(this),this.delay); 
}
}
/*
对联广告调用
第一个参数为ID,第二个参数图片,第三个参数广告距离顶部的距离,
第四个参数表示左右(true代表左,false代表右),第五个参数对联广告的宽度
*/
//new float_ad("ad_l","<img src='http://jzyouth.org.cn/images/float/2009Cherry.gif' />",50,true,64);
//new float_ad("ad_r","<img src='http://jzyouth.org.cn/images/float/2009Cherry.gif' />",50,false,64);

/*
漂浮广告调用
第一个参数中的url代表漂浮广告的图片URL地址(必选项),link链接到页面网址,alt图片提示文字,width图片的宽度(可选项,默认120),heihgt图片的高度(可选项,默认120)
第二个参数中的代表漂浮广告的初始位置,由参数left和top指定
第三个参数代表浮动速度，0为静止，越小浮动速度越快
*/
function ad_close() {
	var obj=document.getElementById("ad_move_sg");
	obj.style.display="none";
}
new move_ad({url:"images/move_ad.gif",link:"cn/sub/hotel.asp",alt:"酒店项目合作",width:49,height:170},{left:40,top:160},20);