var isIE, isNN4, isNNFugly;
	
	/*
	** cross browser
	** nn4: document.layers['layerInQuestion'].visibility = 'visible/hidden'
	** nn6: document.getElementById('layerInQuestion').visibility = 'visible/hidden'
	** ie: document.all['layerInQuestion'].style.visibility = 'visible/hidden'
	*/
	
	if (navigator.appName == "Netscape") {
		var baseVersion = navigator.appVersion.substring(0,1);
		if ((baseVersion == "5") || (baseVersion == "6")) {
			isNNFugly = true;
		}
		else {
			isNN4 = true;
		}
	}
	else {
		isIE = true;
	}	
	
	function Show(layerName) {
		if (isNN4) {
			document.layers[layerName].visibility = 'visible';
		}
		else if (isIE) {
			document.all[layerName].style.visibility = 'visible';
		}
		else {
			document.getElementById(layerName).style.visibility = 'visible';
		}
	}
	
	function Hide(layerName) {
		if (isNN4) {
			document.layers[layerName].visibility = 'hidden';
		}
		else if (isIE) {
			document.all[layerName].style.visibility = 'hidden';
		}
		else {
			document.getElementById(layerName).style.visibility = 'hidden';
		}
	}