var scroller = {
  init:   function() {

    scroller.docH = document.getElementById("content").offsetHeight;
    scroller.contH = document.getElementById("container").offsetHeight;
    scroller.scrollAreaH = document.getElementById("scrollArea").offsetHeight;
      
    scroller.scrollH = (scroller.contH * scroller.scrollAreaH) / scroller.docH;
    document.getElementById("scroller").style.height = Math.round(scroller.scrollH) + "px";
    
    scroller.scrollDist = Math.round(scroller.scrollAreaH-scroller.scrollH);
    
    Drag.init(document.getElementById("scroller"),null,0,0,-1,scroller.scrollDist);
    
    document.getElementById("scroller").onDrag = function (x,y) {
      var scrollY = parseInt(document.getElementById("scroller").style.top);
      var docY = 0 - (scrollY * (scroller.docH - scroller.contH) / scroller.scrollDist);
      document.getElementById("content").style.top = docY + "px";
    }
  }
}

onload = scroller.init;