js 对联广告、漂浮广告封装类（IE,FF,Opera,Safari,Chrome

/*
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='/system/uploads/allimg/090504/2346400.gif' />",50,true,64);
new float_ad("ad_r","<img src='/system/uploads/allimg/090504/2346400.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
*/
new move_ad({url:"/system/uploads/allimg/090504/2346400.gif",link:"https://www.jb51.net",alt:"关于招募“2009中国·大连国际樱桃节”志愿者的通知",width:200,height:200},{left:40,top:160},20);

//核心代码
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";
var vhtmlstring="<div id='"+this.id+"' style='position:absolute; left:"+this.adposition.left+"px; top:"+this.adposition.top+"px; width:"+this.imgoptions.width+"px;";
vhtmlstring+=" height:"+this.imgoptions.height+"px; z-index:10;'><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);
}
}