function Floating ( FloatingObj , MarginY , TopLimit , Percentage , setTime ) {
 this.FloatingObj = FloatingObj;
 this.MarginY = (MarginY) ? MarginY : 140; // top À§Ä¡
 this.TopLimit = (TopLimit) ? TopLimit : 0;
 this.Percentage = (Percentage) ? Percentage : 20;
 this.setTime = (setTime) ? setTime : 10;
 this.FloatingObj.style.position = "absolute";
 this.Body = null;
 this.setTimeOut = null;
 this.Run();
}
Floating.prototype.Run = function () {
 this.Body = document.documentElement.scrollTop>document.body.scrollTop ? document.documentElement : document.body;
 var This = this;
 var FloatingObjTop = (this.FloatingObj.style.top) ? parseInt(this.FloatingObj.style.top,10) : this.FloatingObj.offsetTop;
 var DocTop = this.Body.scrollTop + this.MarginY;
 var MoveY = Math.abs(FloatingObjTop - DocTop);
 if ( DocTop > this.TopLimit ) {
  if ( FloatingObjTop < DocTop ) {
   this.FloatingObj.style.top = FloatingObjTop + Math.ceil( MoveY/this.Percentage ) + "px" ;
  } else {
   this.FloatingObj.style.top = DocTop + "px" ;
  }
 } else {
   this.FloatingObj.style.top = this.TopLimit + "px" ;
 }

 window.clearTimeout(this.setTimeOut);
 this.setTimeOut = window.setTimeout( function () { This.Run(); } , this.setTime );
}