function hideLayer(whichLayer) {
	
		if (document.getElementById) {
		// this is the way the standards work
		document.getElementById(whichLayer).style.visibility = "hidden";
		}
		else if (document.all) {
		// this is the way old msie versions work
		document.all[whichlayer].style.visibility = "hidden";
		}
		else if (document.layers) {
		// this is the way nn4 works
		document.layers[whichLayer].visibility = "hidden";
		}
	
	}
	
	function showLayer(whichLayer) {
	
		if (document.getElementById) {
		// this is the way the standards work
		document.getElementById(whichLayer).style.visibility = "visible";
		}
		else if (document.all) {
		// this is the way old msie versions work
		document.all[whichlayer].style.visibility = "visible";
		}
		else if (document.layers) {
		// this is the way nn4 works
		document.layers[whichLayer].visibility = "visible";
		}
	
	}
	
	function handleClick(whichClick,id) {
		
		if (whichClick == "hide it") {
		// then the user wants to hide the layer
		hideLayer(id);
		
		}
		else if (whichClick == "show it") {
		// then the user wants to show the layer
		showLayer(id);
		}
	
	}