function preloadImgs()
{
	var d = document, a = arguments;
	if (!d.img_arr)
		d.img_arr = new Array();
	for (var i = 0; i < a.length; i++)
	{
		d.img_arr[i] = new Image;
		d.img_arr[i].src = a[i];
	}
}

function swapImg()
{
	var doc = document, args = arguments, elm, n;
	doc.$imgSwaps = new Array ();
	for (n = 2; n < args.length; n += 2)
	{
		elm = getObjectByID (args[n]);
		if (elm)
		{
			doc.$imgSwaps[doc.$imgSwaps.length] = elm;
			elm.$src = elm.src;
			elm.src = args[n + 1];
		}
	}
}

function getObjectByID (id, o)
{
	var c, el, els, f, m, n;
	if (!o)
		o = document;
	if (o.getElementById)
		el = o.getElementById (id);
	else if (o.layers)
		c = o.layers;
	else if (o.all)
		el = o.all[id];
	if (el)
		return el;
	if (o.id == id || o.name == id)
		return o;
	if (o.childNodes)
		c = o.childNodes;
	if (c)
		for (n = 0; n < c.length; n++)
		{
			el = getObjectByID (id, c[n]);
			if (el)
				return el;
		}
	f = o.forms;
	if (f)
		for (n = 0; n < f.length; n++)
		{
			els = f[n].elements;
			for (m = 0; m < els.length; m++)
			{
				el = getObjectByID (id, els[n]);
				if (el)
					return el;
			}
		}
	return null;
}