function floatingObject(obj, x,y){
  this.div=obj;
  this.x=x;
  this.y=y;
  var instance=this;
  Evt.addEventListener(window,"scroll",function(){instance.scroll();},false);
  this.start();
}

floatingObject.prototype.setPos=function(x,y){
  this.x=x; this.y=y;
  this.start();
}

floatingObject.prototype.scroll=function(){  
  if(this.canScroll){
  var oh=this.div.offsetHeight;
  var ow=this.div.offsetWidth;
  if(window.pageXOffset){
    var minx=window.pageXOffset;
    var miny=window.pageYOffset;
    var maxy=miny+window.innerHeight-oh;
    var maxx=minx+window.innerWidth-ow;
  }else{
    var minx=document.body.scrollLeft;
    var miny=document.body.scrollTop;
    var maxy=miny+document.body.clientHeight-oh;
    var maxx=minx+document.body.clientWidth-ow;
  }  
  var x=this.x;
  var y=this.y;
  if(x<minx) x=minx;
  if(y<miny) y=miny;
  if(x>maxx) x=maxx;
  if(y>maxy) y=maxy;
 
  var coord=new Coordinate(x,y);
  coord.reposition(this.div);  
  }
}

floatingObject.prototype.stop=function(){
  this.canScroll=false;
	this.div.style["offsetTop"] = "";
	this.div.style["offsetLeft"] = "";
  this.div.style["position"]="";
  this.div.style["zIndex"]="";

}
floatingObject.prototype.start=function(){
  this.canScroll=true;
  this.div.style["position"]="absolute";
  this.div.style["zIndex"]=99999;  
  this.scroll();
}