// JavaScript Document
function ScrollDiv(id){
if(this==window)
  return new ScrollDiv(id); //ScrollDiv() called as a Function
  var elt=document.getElementById(id);
  var w=elt.offsetWidth;
  var s=elt.parentNode.offsetWidth;
  if(!w || !s || s>w){
    this.scroll=Function(""); return;}
  var divStyle=elt.style;
  var offset=0;
  var maxOffset=s-w;
  var timer=null;
  var self=this;
 
  this.scroll= function(dir,speed){
    var coef=1, S=speed;
    while(S--)coef*=2;
    if (timer)window.clearTimeout(timer);
    switch (dir){
      case 's': //stop
        break;
      case 'l': //left
        if(offset>maxOffset){
          offset-=coef;
          divStyle.left=Math.min(offset,0)+"px";
          timer=window.setTimeout(function(){self.scroll('l',speed)},25)}
        break;
      case 'r': //right
        if(0>offset){
          offset+=coef;
          divStyle.left=Math.max(offset,maxOffset)+"px";
          timer=window.setTimeout(function(){self.scroll('r',speed)},25)}
    }
  }
}