/* 

	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 = "easyscroll";

    // navigation buttons text
    // var nav = ["Scroll Up", "Scroll Down", "Return to Top"];
    var nav = ["", "", "Return to Top"];

    //	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 = 595;

    //
    // 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);
        };
        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].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);