/* 

	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 = "news";

    // navigation buttons text
    var nav = ['<img src="/assets/images/top/up_arrow.jpg" />', '<img src="/assets/images/top/down_arrow.jpg" />'];

    //	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 = 200;

    //
    // 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.height = "auto";
    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);
    };
    container.appendChild(ul);

    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 = false;
        this.scrollTop += "50";
    };
    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);

};


//
// 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);