/* 

   Easy Scroll v1.0
   written by Alen Grakalic, provided by Css Globe (cssglobe.com)
   please visit http://cssglobe.com/post/1495/easy-scroll-accessible-content-scroller
   
*/

this.easyscroll = function(){
   
   // id of the container element 
   var id = "myContent";
   
   // navigation buttons text
   var nav = ["", "", ""];
   
   //   id for each navigation button (OPTIONAL)
   var navId = ["btnUp", "btnDown", "btnReset"];

   // movement speed
   var speed = 5;
   
   // desired height of the container element (in pixels)
   var height = 400;
   
   //
   // END CONFIG
   // do not edit below this line (unless you want to of course :) )
   //

   var obj = document.getElementById(id);
   
   obj.up = false;
   obj.down = false;
   obj.fast = false;

   var container = document.createElement("div");
   var parent = obj.parentNode;
   container.id="easyscroll";
   parent.insertBefore(container,obj);
   parent.removeChild(obj);   
   
   container.style.position = "relative";
   container.style.height = height + "px";
   container.style.overflow = "hidden";
   obj.style.position = "relative";
   obj.style.top = "0";
   obj.style.left = "0";
   container.appendChild(obj);
   
   var btns = new Array();
   var ul = document.createElement("ul");
   ul.id="easyscrollnav";
   for (var i=0;i<nav.length;i++){
      var li = document.createElement("li");
      li.innerHTML = nav[i];
      li.id = navId[i];
      btns.push(li);
      ul.appendChild(li);
   };
   parent.insertBefore(ul,container);

        function insertAfter( newElement, referenceElement ) {
var parent = referenceElement.parentNode;
var nextSibling = referenceElement.nextSibling;
if ( nextSibling) {
parent.insertBefore(newElement, nextSibling);
} else {
parent.appendChild(newElement);
}
} 
   
   btns[0].onmouseover = function(){
      obj.up = true;
      this.className = "over";
   };
   btns[0].onmouseout = function(){
      obj.up = false;
      this.className = "";
   };      
   btns[1].onmouseover = function(){
      obj.down = true;
      this.className = "over";      
   };
   btns[1].onmouseout = function(){
      obj.down = false;
      this.className = "";
   };      
   btns[0].onmousedown = btns[1].onmousedown = function(){
      obj.fast = true;
   };   
   btns[0].onmouseup = btns[1].onmouseup = function(){
      obj.fast = false;
   };      
   btns[2].onmouseover = function(){       
      this.className = "over";
   };   
   btns[2].onmouseout = function(){       
      this.className = "";
   };      
   btns[2].onclick = function(){       
      obj.style.top = "0px";
   };      
      
   this.start = function(){            
      var newTop;
      var objHeight = obj.offsetHeight;
      var top = obj.offsetTop;
      var fast = (obj.fast) ? 2 : 1;
      if(obj.down){       
         newTop = ((objHeight+top) > height) ? top-(speed*fast) : top;   
         obj.style.top = newTop + "px";
      };   
      if(obj.up){       
         newTop = (top < 0) ? top+(speed*fast) : top;
         obj.style.top = newTop + "px";
      };
   };   
   obj.interval = setInterval("start()",50);      
      
};


//
// script initiates on page load. 
//

this.addEvent = function(obj,type,fn){
   if(obj.attachEvent){
      obj['e'+type+fn] = fn;
      obj[type+fn] = function(){obj['e'+type+fn](window.event );}
      obj.attachEvent('on'+type, obj[type+fn]);
   } else {
      obj.addEventListener(type,fn,false);
   };
};
addEvent(window,"load",easyscroll);