function show( whichLayer ) {

        if (document.getElementById) {
		    // MSIE 5.x, Opera 4.x, Mozilla m17, Netscape 6PR2
                    layerName = document.getElementById(whichLayer);
                    layerName.style.visibility = "visible";
        }
        else {
            if (document.all) {
		    // MSIE 4.x
                    layerName = eval(whichLayer);
                    layerName.style.visibility = "visible";
            } else {
		if (document.layers) {
		    // Netscape 4.x
                    layerName = whichLayer;
                    document.layers[layerName].visibility = "visible";
		}
            }
        }
    }

 function hide( whichLayer ) {

        if (document.getElementById) {
		    // MSIE 5.x, Opera 4.x, Mozilla m17, Netscape 6PR2
                    layerName = document.getElementById(whichLayer);
                    layerName.style.visibility = "hidden";
        }
        else {
            if (document.all) {
		    // MSIE 4.x
                    layerName = eval(whichLayer);
                    layerName.style.visibility = "hidden";
            } else {
		if (document.layers) {
		    // Netscape 4.x
                    layerName = whichLayer;
                    document.layers[layerName].visibility = "hidden";
		}
            }
        }
    }