Event.observe(window, "load",
	function() {
		var margin_left = $('layer').getWidth() / 2;
		$('layer').setStyle({ marginLeft:"-"+margin_left+"px", display:"block" });
	}
);

function hide() {
	$('layer').setStyle({ display:"none" });	
	if (typeof document.body.style.maxHeight === "undefined")
		$('layer-IE').setStyle({ display:"none" });	
}