var floatingMenuId = 'floatdiv';
var floatingMenu =
{
    targetX: -200,
    targetY: -110,

    hasInner: typeof(window.innerWidth) == 'number',
    hasElement: typeof(document.documentElement) == 'object' && typeof(document.documentElement.clientWidth) == 'number',

    menu: document.getElementById ? document.getElementById(floatingMenuId) : document.all ? document.all[floatingMenuId] : document.layers[floatingMenuId]
          
};

floatingMenu.move = function ()
{	
	floatingMenu.menu.style.left = floatingMenu.nextX + 'px';
    floatingMenu.menu.style.top = floatingMenu.nextY + 'px';
}

floatingMenu.computeShifts = function ()
{
    var de = document.documentElement;

    floatingMenu.shiftX = floatingMenu.hasInner ? pageXOffset : floatingMenu.hasElement ? de.scrollLeft : document.body.scrollLeft;
    
    if (floatingMenu.targetX < 0)
    {
        floatingMenu.shiftX += floatingMenu.hasElement ? de.clientWidth : document.body.clientWidth;
    }

    floatingMenu.shiftY = floatingMenu.hasInner ? pageYOffset : floatingMenu.hasElement ? de.scrollTop : document.body.scrollTop;
    
    if (floatingMenu.targetY < 0)
    {
        if (floatingMenu.hasElement && floatingMenu.hasInner)
        {
            // Handle Opera 8 problems
            floatingMenu.shiftY += de.clientHeight > window.innerHeight ? window.innerHeight : de.clientHeight
        }
        else
        {
            floatingMenu.shiftY += floatingMenu.hasElement ? de.clientHeight : document.body.clientHeight;
        }
    }
}

floatingMenu.calculateCornerX = function()
{
    if (floatingMenu.targetX != 'center')
        return floatingMenu.shiftX + floatingMenu.targetX;

    var width = parseInt(floatingMenu.menu.offsetWidth);

    var cornerX =
        floatingMenu.hasElement ? (floatingMenu.hasInner ? pageXOffset : document.documentElement.scrollLeft) + (document.documentElement.clientWidth - width)/2 : document.body.scrollLeft + (document.body.clientWidth - width)/2;
    return cornerX;
};

floatingMenu.calculateCornerY = function()
{
    if (floatingMenu.targetY != 'center')
        return floatingMenu.shiftY + floatingMenu.targetY;

    var height = parseInt(floatingMenu.menu.offsetHeight);

    // Handle Opera 8 problems
    var clientHeight = 
        floatingMenu.hasElement && floatingMenu.hasInner && document.documentElement.clientHeight > window.innerHeight ? window.innerHeight: document.documentElement.clientHeight

    var cornerY =
        floatingMenu.hasElement ? (floatingMenu.hasInner ? pageYOffset : document.documentElement.scrollTop) + (clientHeight - height)/2 : document.body.scrollTop + (document.body.clientHeight - height)/2;
    return cornerY;
};

floatingMenu.doFloat = function()
{
    var stepX, stepY;

    floatingMenu.computeShifts();

    var cornerX = floatingMenu.calculateCornerX();
    var stepX = (cornerX - floatingMenu.nextX) * .1;
    if (Math.abs(stepX) < .15)
    {
        stepX = cornerX- floatingMenu.nextX;
    }

    var cornerY = floatingMenu.calculateCornerY();

    var stepY = (cornerY - floatingMenu.nextY) * .07;
    if (Math.abs(stepY) < .5)
    {
        stepY = cornerY - floatingMenu.nextY;
    }

    if (Math.abs(stepX) > 0 ||
        Math.abs(stepY) > 0)
    {
        floatingMenu.nextX += stepX;
        floatingMenu.nextY += stepY;
        floatingMenu.move();
    }

    setTimeout('floatingMenu.doFloat()', 20);
};

// addEvent designed by Aaron Moore
floatingMenu.addEvent = function(element, listener, handler)
{
    if(typeof element[listener] != 'function' || 
       typeof element[listener + '_num'] == 'undefined')
    {
        element[listener + '_num'] = 0;
        if (typeof element[listener] == 'function')
        {
            element[listener + 0] = element[listener];
            element[listener + '_num']++;
        }
        element[listener] = function(e)
        {
            var r = true;
            e = (e) ? e : window.event;
            for(var i = element[listener + '_num'] -1; i >= 0; i--)
            {
                if(element[listener + i](e) == false)
                    r = false;
            }
            return r;
        }
    }

    //if handler is not already stored, assign it
    for(var i = 0; i < element[listener + '_num']; i++)
        if(element[listener + i] == handler)
            return;
    element[listener + element[listener + '_num']] = handler;
    element[listener + '_num']++;
};

floatingMenu.init = function()
{
    floatingMenu.initSecondary();
    floatingMenu.doFloat();
};

// Some browsers init scrollbars only after
// full document load.
floatingMenu.initSecondary = function()
{
    floatingMenu.computeShifts();
    floatingMenu.nextX = floatingMenu.calculateCornerX();
    floatingMenu.nextY = floatingMenu.calculateCornerY();
    //alert(floatingMenu.nextX);
    floatingMenu.move();
}

/*if (document.layers)
    floatingMenu.addEvent(window, 'onload', floatingMenu.init);
else
{
    floatingMenu.init();
    floatingMenu.addEvent(window, 'onload', floatingMenu.initSecondary);
}*/

floatingMenu.goTop = function(){
	currentST = document.documentElement.scrollTop;
	if (currentST > 0) {
		currentST = (currentST - 5) * .9;
		scroll(0,currentST);
		setTimeout('floatingMenu.goTop()',20);
	}
}