请帮忙看看“带关闭功能的网页图片漂浮广告”

请帮忙看看“带关闭功能的网页图片漂浮广告”为什么点关闭关不了。
var hbcms_close_str = '<div onClick="closeBanner();" style="color:gray;font-size:8pt;cursor:hand;text-align:center;width:100%;background-color: #efefef;line-height:200%">关闭</div>';
var left_img='<a target=_blank href="http://"><img src=one.gif border=0> </a>'+  hbcms_close_str;
var right_img='<a target=_blank href="http://"><img src=two.gif border=0> </a>'+ hbcms_close_str;
 var delta=0.05
 var collection;
 var closeB=false;
 function floaters() {
  this.items = [];
  this.addItem = function(id,x,y,content)
      {
     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+'</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 closeBanner()
{
   closeB=true;
   return;
}  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 = '';
   }
  } 
  
 var theFloaters  = new floaters();
 theFloaters.addItem('followDiv1','document.body.clientWidth-200',100,''+right_img+'');
 theFloaters.addItem('followDiv2',6,100,''+left_img+'');
 theFloaters.play();