浮广告，兼容ie、firefox，多个漂浮不冲突，调用只需两行代码

将广告内容放在div中，设置一个id，然后用下面方法调用
var adcls=new AdMove("div的id");
adcls.Run();
注意，在调用前要先引用Main.js和AdFloat.js,div也要在调用前写好，原因就不用说了吧

或者也可以用下面方法，在页面加载完成时调用，就不用考虑位置了addEvent(window,"load",initad);
function initad(){
var adcls=new AdMove("div的id");
adcls.Run();
}

还有两个方法一般情况下没什么用，有兴趣的可以试试，功能是设置漂浮的起始坐标和方向的，如果省掉的话是随机位置随机方向
adcls.SetLocation(x,y)
adcls.SetDirection(dirx,diry)

漂浮广告的斜率是每次碰壁后随机改变的，这样就决不可能出现多个广告，起始位置和方向一致导致其中一个总是被挡住，虽然几率很小

 

下面是演示代码

<! DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >
< html  xmlns ="http://www.w3.org/1999/xhtml"   >
< head >< title > wahaha </ title >
     < meta  http-equiv ="Content-Type"  content ="text/html;charset=gb2312"   />
     < script  type ="text/javascript" >
     <!--
// 公共脚本文件 main.js
function  addEvent(obj,evtType,func,cap){
    cap = cap || false ;
     if (obj.addEventListener){
        obj.addEventListener(evtType,func,cap);
         return   true ;
    } else   if (obj.attachEvent){
         if (cap){
            obj.setCapture();
             return   true ;
        } else {
             return  obj.attachEvent( " on "   +  evtType,func);
        }
    } else {
         return   false ;
    }
}
function  getPageScroll(){
     var  xScroll,yScroll;
     if  (self.pageXOffset) {
        xScroll  =  self.pageXOffset;
    }  else   if  (document.documentElement  &&  document.documentElement.scrollLeft){
        xScroll  =  document.documentElement.scrollLeft;
    }  else   if  (document.body) {
        xScroll  =  document.body.scrollLeft;
    }
     if  (self.pageYOffset) {
        yScroll  =  self.pageYOffset;
    }  else   if  (document.documentElement  &&  document.documentElement.scrollTop){
        yScroll  =  document.documentElement.scrollTop;
    }  else   if  (document.body) {
        yScroll  =  document.body.scrollTop;
    }
    arrayPageScroll  =   new  Array(xScroll,yScroll);
     return  arrayPageScroll;
}
function  GetPageSize(){
     var  xScroll, yScroll;
     if  (window.innerHeight  &&  window.scrollMaxY) {    
        xScroll  =  document.body.scrollWidth;
        yScroll  =  window.innerHeight  +  window.scrollMaxY;
    }  else   if  (document.body.scrollHeight  >  document.body.offsetHeight){
        xScroll  =  document.body.scrollWidth;
        yScroll  =  document.body.scrollHeight;
    }  else  {
        xScroll  =  document.body.offsetWidth;
        yScroll  =  document.body.offsetHeight;
    }
     var  windowWidth, windowHeight;
     if  (self.innerHeight) {
        windowWidth  =  self.innerWidth;
        windowHeight  =  self.innerHeight;
    }  else   if  (document.documentElement  &&  document.documentElement.clientHeight) {
        windowWidth  =  document.documentElement.clientWidth;
        windowHeight  =  document.documentElement.clientHeight;
    }  else   if  (document.body) {
        windowWidth  =  document.body.clientWidth;
        windowHeight  =  document.body.clientHeight;
    }    
     if (yScroll  <  windowHeight){
        pageHeight  =  windowHeight;
    }  else  { 
        pageHeight  =  yScroll;
    }
     if (xScroll  <  windowWidth){    
        pageWidth  =  windowWidth;
    }  else  {
        pageWidth  =  xScroll;
    }
    arrayPageSize  =   new  Array(pageWidth,pageHeight,windowWidth,windowHeight) 
     return  arrayPageSize;
}
// 广告脚本文件 AdMove.js
/*
例子
<div id="Div2">
    ***** content ******
</div>
var ad=new AdMove("Div2");
ad.Run();
*/
// //////////////////////////////////////////////////////
var  AdMoveConfig = new  Object();
AdMoveConfig.IsInitialized = false ;
AdMoveConfig.ScrollX = 0 ;
AdMoveConfig.ScrollY = 0 ;
AdMoveConfig.MoveWidth = 0 ;
AdMoveConfig.MoveHeight = 0 ;
AdMoveConfig.Resize = function (){
     var  winsize = GetPageSize();
    AdMoveConfig.MoveWidth = winsize[ 2 ];
    AdMoveConfig.MoveHeight = winsize[ 3 ];
    AdMoveConfig.Scroll();
}
AdMoveConfig.Scroll = function (){
     var  winscroll = getPageScroll();
    AdMoveConfig.ScrollX = winscroll[ 0 ];
    AdMoveConfig.ScrollY = winscroll[ 1 ];
}
addEvent(window, " resize " ,AdMoveConfig.Resize);
addEvent(window, " scroll " ,AdMoveConfig.Scroll);
function  AdMove(id){
     if ( ! AdMoveConfig.IsInitialized){
        AdMoveConfig.Resize();
        AdMoveConfig.IsInitialized = true ;
    }
     var  obj = document.getElementById(id);
    obj.style.position = " absolute " ;
     var  W = AdMoveConfig.MoveWidth - obj.offsetWidth;
     var  H = AdMoveConfig.MoveHeight - obj.offsetHeight;
     var  x  =  W * Math.random(),y  =  H * Math.random();
     var  rad = (Math.random() + 1 ) * Math.PI / 6;
     var  kx = Math.sin(rad),ky = Math.cos(rad);
     var  dirx  =  (Math.random() < 0.5 ? 1 : - 1 ), diry  =  (Math.random() < 0.5 ? 1 : - 1 );
     var  step  =   1 ;
     var  interval;
     this .SetLocation = function (vx,vy){x = vx;y = vy;}
     this .SetDirection = function (vx,vy){dirx = vx;diry = vy;}
    obj.CustomMethod = function (){
        obj.style.left  =  (x  +  AdMoveConfig.ScrollX)  +   " px " ;
        obj.style.top  =  (y  +  AdMoveConfig.ScrollY)  +   " px " ;
        rad = (Math.random() + 1 ) * Math.PI / 6;
        W = AdMoveConfig.MoveWidth - obj.offsetWidth;
        H = AdMoveConfig.MoveHeight - obj.offsetHeight;
        x  =  x  +  step * kx * dirx;
         if  (x  <   0 ){dirx  =   1 ;x  =   0 ;kx = Math.sin(rad);ky = Math.cos(rad);} 
         if  (x  >  W){dirx  =   - 1 ;x  =  W;kx = Math.sin(rad);ky = Math.cos(rad);}
        y  =  y  +  step * ky * diry;
         if  (y  <   0 ){diry  =   1 ;y  =   0 ;kx = Math.sin(rad);ky = Math.cos(rad);} 
         if  (y  >  H){diry  =   - 1 ;y  =  H;kx = Math.sin(rad);ky = Math.cos(rad);}
    }
     this .Run = function (){
         var  delay  =   10 ;
        interval = setInterval(obj.CustomMethod,delay);
        obj.onmouseover = function (){clearInterval(interval);}
        obj.onmouseout = function (){interval = setInterval(obj.CustomMethod, delay);}
    }
}
     // -->
</ script >
</ head >
< body >
     < div  id ="gg1"  style ="width:100px;height:100px;background-color:red;color:yellow" >
        广告1
     </ div >
     < div  id ="gg2"  style ="width:100px;height:100px;background-color:blue;color:yellow" >
        广告2
     </ div >
     < div  id ="gg3"  style ="width:100px;height:100px;background-color:green;color:yellow" >
        广告3
     </ div >
     < script  type ="text/javascript" >
     <!--
         var  ad1 = new  AdMove( " gg1 " );
        ad1.Run();
     var  ad2 = new  AdMove( " gg2 " );
        ad2.Run();
     var  ad3 = new  AdMove( " gg3 " );
        ad3.Run();
     // -->
     </ script >
</ body >
</ html >