/*

	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

*/

function easyscroll(id){

	// id of the container element
	//var id = "projects-list";

	// navigation buttons text
	var nav = ['<img src="/fileadmin/layouts/gfx/arrow_up.png" />', '<img src="/fileadmin/layouts/gfx/arrow_down.png" />'];

	//	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 = 100;

	//
	// 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 = "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);
	};
	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;
	}

	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);

};