var ztop = 100;
var current = "dummy";
function slide(layer) {
	if (layer != current) {
		ztop++;
		$(current).animate(
			{
				left: 152,
				opacity: 0
			},
			'slow'
		);
		$(current).css('visibility', 'hidden');

		$(layer).css('visibility', 'visible');
		$(layer).css('z-index', ztop);
		$(layer).animate(
			{
				left: 248,
				opacity: 1
			},
			'slow'
		);
		current = layer;
	}
}