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HTML

              
                
<div class="wrapper">
  <div id="container">
    <div class="parent">
      <h2>Custom scrollbar</h2>
      Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. Many different text. 
    </div>
  </div>
</div>

              
            
!

CSS

              
                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;
}

              
            
!

JS

              
                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

Console