function $() {
    var elements = new Array();

    for (var i = 0; i < arguments.length; i++) {
        var element = arguments[i];

        if (typeof element == 'string')
            element = document.getElementById(element);

        if (arguments.length == 1)
            return element;

        elements.push(element);
    }

    return elements;
}

function switchMainImage(imageToShow)  //, layerCount)
{
        // Max number of thumbs per page is 20.
	for (i = 1; i < 21; i++) {
		layerName = "image" + i;
                if (null === $(layerName)) continue;
		if (layerName == imageToShow) {
			$(layerName).style.visibility = 'visible';
		} else {
			$(layerName).style.visibility = 'hidden';
		}
	}
}