/* 

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
	
*/

var objs = new Array();

this.easyscroll = function(easyScrollId, easyScrollHeight, easyScrollContainerId, easyScrollNavId)
{

    // id of the container element 
    var id = easyScrollId;

    // navigation buttons text
    var nav = [" ", " ", " "];

    //	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 = easyScrollHeight;

    // index
    var index = objs.length;

    //
    // END CONFIG
    // do not edit below this line (unless you want to of course :) )
    //

    var obj = document.getElementById(id);

    objs.push(obj);

    obj.up = false;
    obj.down = false;
    obj.fast = false;

    if (easyScrollContainerId == null || easyScrollContainerId == '')
        easyScrollContainerId = "easyscroll";

    var container = document.createElement("div");
    var parent = obj.parentNode;
    container.id = easyScrollContainerId;
    parent.insertBefore(container, obj);
    parent.removeChild(obj);

    container.style.position = "relative";
    container.style.clear = "both";
    container.style.height = height + "px";
    container.style.overflow = "hidden";
    obj.style.position = "absolute";
    obj.style.top = "0";
    obj.style.left = "0";
    container.appendChild(obj);

    if (container.offsetHeight >= obj.offsetHeight)
        return;

    if (easyScrollNavId == null || easyScrollNavId == '')
        easyScrollNavId = "easyscrollnav";

    var btns = new Array();
    var ul = document.createElement("ul");
    ul.id = easyScrollNavId;
    for (var i = 0; i < nav.length; i++)
    {
        var li = document.createElement("li");
        li.innerHTML = nav[i];
        li.className = 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(index)
    {
        var obj = objs[index];

        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(" + index + ")", 50);
};


//
// script initiates on page load. 
//

this.addEvent = function(obj, type, fn)
{
    try
    {
        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);
        };
    }
    catch (ex) { }
};