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<div class="wrapper">
  <div id="container">
    <div class="parent">
      <h2>Custom scrollbar</h2>
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    </div>
  </div>
</div>

            
          
!
            
              body {
  background: #999;
  margin: 0;
  padding: 0;
}

.wrapper {
  -moz-border-radius: 5px;
  -webkit-border-radius: 5px;
  background: #FFF;
  border: 1px #000 solid;
  margin: 20px auto;
  padding: 15px;
  position: relative;
  width: 600px;
  height: 600px;
}

#container {
  width: 580px;
  height: 580px;
  padding: 5px;
  margin-top: 5px;
  overflow: auto;
  position: relative;
}

.ssb_down {
  background-color: #33ccaa;
  bottom:0;
  cursor:pointer;
  position:absolute;
  right:0;
  border-radius: 10px;
}

.ssb_sb {
  background-color: #22aabb;
  cursor:pointer;
  position:absolute;
  right:0;
  border-radius: 10px;
}

.ssb_sb_down {
  background-color: #1199aa;
}

.ssb_sb_over {
  background-color: #33bbcc;
}

.ssb_st {
  background-color: #dedede;
  cursor:pointer;
  height:100%;
  position:absolute;
  right:0;
  top:0;
  border-radius: 10px;
}

.ssb_up {
  background-color: #33ccaa;
  cursor:pointer;
  position:absolute;
  right:0;
  top:0;
  border-radius: 10px;
}

.parent {
  font-family:verdana;
  height:100%;
  padding:10px;
  position:relative;
}

            
          
!
            
              var ssb = {
  aConts  : [],
  mouseY : 0,
  N  : 0,
  asd : 0, /*active scrollbar element*/
  sc : 0,
  sp : 0,
  to : 0,
  
  // constructor
  scrollbar : function (cont_id) {
    var cont = document.getElementById(cont_id);
    
    // perform initialization
    if (! ssb.init()) return false;
    
    var cont_clone = cont.cloneNode(false);
    cont_clone.style.overflow = "hidden";
    cont.parentNode.appendChild(cont_clone);
    cont_clone.appendChild(cont);
    cont.style.position = 'absolute';
    cont.style.left = cont.style.top = '0px';
    cont.style.width = cont.style.height = '100%';
    
    // adding new container into array
    ssb.aConts[ssb.N++] = cont;
    
    cont.sg = false;
    
    //creating scrollbar child elements
    cont.st = this.create_div('ssb_st', cont, cont_clone);
    cont.sb = this.create_div('ssb_sb', cont, cont_clone);
    cont.su = this.create_div('ssb_up', cont, cont_clone);
    cont.sd = this.create_div('ssb_down', cont, cont_clone);
    
    // on mouse down processing
    cont.sb.onmousedown = function (e) {
      if (! this.cont.sg) {
        if (! e) e = window.event;
        
        ssb.asd = this.cont;
        this.cont.yZ = e.screenY;
        this.cont.sZ = cont.scrollTop;
        this.cont.sg = true;
        
        // new class name
        this.className = 'ssb_sb ssb_sb_down';
      }
      return false;
    }
    // on mouse down on free track area - move our scroll element too
    cont.st.onmousedown = function (e) {
      if (! e) e = window.event;
      ssb.asd = this.cont;
      
      ssb.mouseY = e.clientY + document.body.scrollTop + document.documentElement.scrollTop;
      for (var o = this.cont, y = 0; o != null; o = o.offsetParent) y += o.offsetTop;
      this.cont.scrollTop = (ssb.mouseY - y - (this.cont.ratio * this.cont.offsetHeight / 2) - this.cont.sw) / this.cont.ratio;
      this.cont.sb.onmousedown(e);
    }
    
    // onmousedown events
    cont.su.onmousedown = cont.su.ondblclick = function (e) { ssb.mousedown(this, -1); return false; }
    cont.sd.onmousedown = cont.sd.ondblclick = function (e) { ssb.mousedown(this,  1); return false; }
    
    //onmouseout events
    cont.su.onmouseout = cont.su.onmouseup = ssb.clear;
    cont.sd.onmouseout = cont.sd.onmouseup = ssb.clear;
    
    // on mouse over - apply custom class name: ssb_sb_over
    cont.sb.onmouseover = function (e) {
      if (! this.cont.sg) this.className = 'ssb_sb ssb_sb_over';
      return false;
    }
    
    // on mouse out - revert back our usual class name 'ssb_sb'
    cont.sb.onmouseout  = function (e) {
      if (! this.cont.sg) this.className = 'ssb_sb';
      return false;
    }
    
    // onscroll - change positions of scroll element
    cont.ssb_onscroll = function () {
      this.ratio = (this.offsetHeight - 2 * this.sw) / this.scrollHeight;
      this.sb.style.top = Math.floor(this.sw + this.scrollTop * this.ratio) + 'px';
    }
    
    // scrollbar width
    cont.sw = 12;
    
    // start scrolling
    cont.ssb_onscroll();
    ssb.refresh();
    
    // binding own onscroll event
    cont.onscroll = cont.ssb_onscroll;
    return cont;
  },
  
  // initialization
  init : function () {
    if (window.oper || (! window.addEventListener && ! window.attachEvent)) { return false; }
    
    // temp inner function for event registration
    function addEvent (o, e, f) {
      if (window.addEventListener) { o.addEventListener(e, f, false); ssb.w3c = true; return true; }
      if (window.attachEvent) return o.attachEvent('on' + e, f);
      return false;
    }
    
    // binding events
    addEvent(window.document, 'mousemove', ssb.onmousemove);
    addEvent(window.document, 'mouseup', ssb.onmouseup);
    addEvent(window, 'resize', ssb.refresh);
    return true;
  },
  
  // create and append div finc
  create_div : function(c, cont, cont_clone) {
    var o = document.createElement('div');
    o.cont = cont;
    o.className = c;
    cont_clone.appendChild(o);
    return o;
  },
  // do clear of controls
  clear : function () {
    clearTimeout(ssb.to);
    ssb.sc = 0;
    return false;
  },
  // refresh scrollbar
  refresh : function () {
    for (var i = 0, N = ssb.N; i < N; i++) {
      var o = ssb.aConts[i];
      o.ssb_onscroll();
      o.sb.style.width = o.st.style.width = o.su.style.width = o.su.style.height = o.sd.style.width = o.sd.style.height = o.sw + 'px';
      o.sb.style.height = Math.ceil(Math.max(o.sw * .5, o.ratio * o.offsetHeight) + 1) + 'px';
    }
  },
  // arrow scrolling
  arrow_scroll : function () {
    if (ssb.sc != 0) {
      ssb.asd.scrollTop += 6 * ssb.sc / ssb.asd.ratio;
      ssb.to = setTimeout(ssb.arrow_scroll, ssb.sp);
      ssb.sp = 32;
    }
  },
  
  /* event binded functions : */
  // scroll on mouse down
  mousedown : function (o, s) {
    if (ssb.sc == 0) {
      // new class name
      o.cont.sb.className = 'ssb_sb ssb_sb_down';
      ssb.asd = o.cont;
      ssb.sc = s;
      ssb.sp = 400;
      ssb.arrow_scroll();
    }
  },
  // on mouseMove binded event
  onmousemove : function(e) {
    if (! e) e = window.event;
    // get vertical mouse position
    ssb.mouseY = e.screenY;
    if (ssb.asd.sg) ssb.asd.scrollTop = ssb.asd.sZ + (ssb.mouseY - ssb.asd.yZ) / ssb.asd.ratio;
  },
  // on mouseUp binded event
  onmouseup : function (e) {
    if (! e) e = window.event;
    var tg = (e.target) ? e.target : e.srcElement;
    if (ssb.asd && document.releaseCapture) ssb.asd.releaseCapture();
    
    // new class name
    if (ssb.asd) ssb.asd.sb.className = (tg.className.indexOf('scrollbar') > 0) ? 'ssb_sb ssb_sb_over' : 'ssb_sb';
    document.onselectstart = '';
    ssb.clear();
    ssb.asd.sg = false;
  }
}

window.onload = function() {
  ssb.scrollbar('container'); // scrollbar initialization
}

            
          
!
999px
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Console