//preload image
	var collimg = new Image();
	collimg.src = "components/com_mamboboard/js/shrink.gif";
	var expimg = new Image();
	collimg.src = "components/com_mamboboard/js/expand.gif";

	function ShowHideLayer(boxID) {
		/* Obtain reference for the selected boxID layer and its button */
		var box = document.getElementById("box"+boxID);
		var boxbtn = document.getElementById("btn"+boxID);
		
		/* If the selected box is currently invisible, show it */
		if(box.style.display == "none" || box.style.display=="all") {
			box.style.display = "block";
			boxbtn.src = "components/com_mamboboard/js/shrink.gif";
		}
		/* otherwise hide it */
		else {
			box.style.display = "none";
			boxbtn.src = "components/com_mamboboard/js/expand.gif";
		}
	}