var delta=0.15
    var collection;
    function floaters() {
        this.items    = [];
        this.addItem    = function(id,x,y,content,url,content2,url,content3)
                 {
                    document.write('<DIV id='+id+' style="Z-INDEX: 10; POSITION: absolute; width:80px; height:60px;left:'+(typeof(x)=='string'?eval(x):x)+';top:'+(typeof(y)=='string'?eval(y):y)+'">'+content+url+content2+url+content3+'</DIV>');
                    
                    var newItem                = {};
                    newItem.object            = document.getElementById(id);
                    newItem.x                = x;
                    newItem.y                = y;

                    this.items[this.items.length]        = newItem;
                 }
        this.play    = function()
                 {
                    collection                = this.items
                    setInterval('play()',10);
                 }
        }
        function play()
        {

            for(var i=0;i<collection.length;i++)
            {
                var followObj        = collection[i].object;
                var followObj_x        = (typeof(collection[i].x)=='string'?eval(collection[i].x):collection[i].x);
                var followObj_y        = (typeof(collection[i].y)=='string'?eval(collection[i].y):collection[i].y);

                if(followObj.offsetLeft!=(document.body.scrollLeft+followObj_x)) {
                    var dx=(document.body.scrollLeft+followObj_x-followObj.offsetLeft)*delta;
                    dx=(dx>0?1:-1)*Math.ceil(Math.abs(dx));
                    followObj.style.left=followObj.offsetLeft+dx;
                    }

                if(followObj.offsetTop!=(document.body.scrollTop+followObj_y)) {
                    var dy=(document.body.scrollTop+followObj_y-followObj.offsetTop)*delta;
                    dy=(dy>0?1:-1)*Math.ceil(Math.abs(dy));
                    followObj.style.top=followObj.offsetTop+dy;
                    }
                followObj.style.display    = '';
            }
        }    
        
if (window.screen.width>=1024) //当分辨率达到 1024 时才显示广告
    {
    var theFloaters        = new floaters();

//-------------随即 flash 开始------------    
var swfnumber=3; //flash 文件的“对”数（每两个成一对）
var swfnumber2=Math.floor(Math.random()*swfnumber+1)
switch(swfnumber2)
{
case 1:
url='/flash/100x300.swf';
url2='/flash/100x300_2.swf';
break;
case 2:
url='/flash/100x300_3.swf';
url2='/flash/100x300_4.swf';
break;
case 3:
url='/flash/100x300_5.swf';
url2='/flash/100x300_6.swf';
break;
}
//-------------随即 flash 结束------------

    theFloaters.addItem('followDiv1','document.body.clientWidth-104',20,'<object classid=clsid27CDB6E-AE6D-11cf-96B8-444553540000 codebase=http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,0,0 WIDTH=100 HEIGHT=300 id=leftFF> <param name=movie value=\"',url,'\"> <param name=quality value=high> <param name=menu value=false> <embed id=leftFFG src=\"',url,'\" quality=high width=100 height=300 name=zuo TYPE=application/x-shockwave-flash PLUGINSPAGE=http://www.macromedia.com/go/getflashplayer></embed></object>');
    theFloaters.addItem('followDiv2',0,20,'<object classid=clsid27CDB6E-AE6D-11cf-96B8-444553540000 codebase=http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,0,0 WIDTH=100 HEIGHT=300 id=youFF> <param name=movie value=\"',url2,'\"> <param name=quality value=high> <param name=menu value=false> <embed id=youffg src=\"',url2,'\" quality=high width=100 height=300 name=you type=application/x-shockwave-flash PLUGINSPAGE=http://www.macromedia.com/go/getflashplayer></embed></object>');
    theFloaters.play();
    }

    function leftFFG_DoFSCommand(command, args) {
        document.all.followDiv1.style.visibility = "hidden";
        document.all.followDiv2.style.visibility = "hidden";
    }
    
    function youFFG_DoFSCommand(command,args){
        leftFFG_DoFSCommand(command,args);
    }
    <!--
    if (document.all){
        document.write("<Script language=\"javascript\" For=\"youFF\" Event=\"FSCommand(command,args)\">\n";
        document.write("    leftFFG_DoFSCommand(command,args);\n";
        document.write("</Script>\n";
        document.write("<Script language=\"javascript\" For=\"leftFF\" Event=\"FSCommand(command,args)\">\n";
        document.write("    leftFFG_DoFSCommand(command,args);\n";
        document.write("</Script>\n";
    }
    //-->
//-------------------对联广告代码结束----------------------
就是上面的代码！！