/* 

	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";
	
		// movement speed
		var speed = 5;
		
		// desired height of the container element (in pixels)
		var height = $("#seccoes").height();
		
		//
		// 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;
		
	if($("#myContent").height()-height<=0 ) {
		var nav = ["<a href='javascript:history.back();'><img src='/pt/img/back.jpg' border='0'/></a>"];
		
		//	id for each navigation button (OPTIONAL)
		var navId = ["btnBack"];
	
		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("div");
		ul.id="easyscrollnav";
		ul.innerHTML="<h2 style='float:left;'>"+sTitle+"</h2>";
		for (var i=0;i<nav.length;i++){
			var li = document.createElement("span");
			li.innerHTML = nav[i];
			li.id = navId[i];
			btns.push(li);
			ul.appendChild(li);
		};
		parent.insertBefore(ul,container);
		
	}else{
		$("#ngallery").height($("#myContent").height()+150);
		//adding the event listerner for Mozilla
		if(window.addEventListener) document.addEventListener('DOMMouseScroll', moveObject, false); 
		document.onmousewheel = moveObject;

		// navigation buttons text
		var nav = ["<img src='/pt/img/up.jpg' />", "<img src='/pt/img/down.jpg' />", "<img src='/pt/img/reset.jpg'/>", "<a href='javascript:history.back();'><img src='/pt/img/back.jpg' border='0'/></a>"];
		
		//	id for each navigation button (OPTIONAL)
		var navId = ["btnUp", "btnDown", "btnReset","btnBack"];
	
		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("div");
		ul.id="easyscrollnav";
		ul.innerHTML="<h2 style='float:left;'>"+sTitle+"</h2>";
		for (var i=0;i<nav.length;i++){
			var li = document.createElement("span");
			li.innerHTML = nav[i];
			li.id = navId[i];
			btns.push(li);
			ul.appendChild(li);
		};
		parent.insertBefore(ul,container);
		
		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].onclick = 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) ? 3 : 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()",40);		
			
	}
};
//
// 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);
	};

};
function moveObject(event){
	var delta = 0;
	if (!event) event = window.event;
	if($.browser.msie){
		event.cancelBubble=true;
	}else{
		event.preventDefault();
	}
	// normalize the delta
	if (event.wheelDelta) {
		// IE and Opera
		delta = event.wheelDelta / 60;
	} else if (event.detail) {
		// W3C
		delta = -event.detail / 2;
	}
	obj=document.getElementById("myContent")
	var currPos=obj.offsetTop;
 	//calculating the next position of the object
	if(delta>0){ //decrease
	//alert("CurPos =" + currPos + " Delta = "+delta)
		if ((currPos + delta*10) >0) {
			currPos=0;
		}else{
			if(currPos < 0 ){
					currPos=parseInt(currPos)+(delta*10);		
			} 
		}
	}else{
		//currPos = 0;
		if(obj.clientHeight+currPos>$("#seccoes").height()){currPos=parseInt(currPos)+(delta*10);}
	}
//	if((currPos!=0 && delta>0) || (currPos != $("#seccoes").height() && delta<0)) currPos=parseInt(currPos)+(delta*10);
 
	//moving the position of the object
	obj.style.top = currPos+"px";
}