/* 

	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", "barraHorizontal", "btnDown", "btnReset"];

	// movement speed
	var speed = 5;
	
	// desired height of the container element (in pixels)
	var height = 530; /* tenia 480 */
	
	//
	// END CONFIG
	// do not edit below this line (unless you want to of course :) )
	//

	var obj = document.getElementById(id);
	if (obj != null) {
		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 = "absolute";
		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);
		};
		if (document.getElementById(id).offsetHeight >= 530)
			parent.insertBefore(ul,container);
	
		btns[0].onmouseover = function(){
			obj.up = true;
			this.className = "over";
		};
		btns[0].onmouseout = function(){
			obj.up = false;
			this.className = "";
		};		
		btns[2].onmouseover = function(){
			obj.down = true;
			this.className = "over";		
		};
		btns[2].onmouseout = function(){
			obj.down = false;
			this.className = "";
		};		
		btns[0].onmousedown = btns[2].onmousedown = function(){
			obj.fast = true;
		};	
		btns[0].onmouseup = btns[2].onmouseup = function(){
			obj.fast = false;
		};		
		btns[3].onmouseover = function(){ 		
			this.className = "over";
		};	
		btns[3].onmouseout = function(){ 		
			this.className = "";
		};		
		btns[3].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);