function hideDiv() { 
	if (document.getElementById) { // DOM3 = IE5, NS6 
		document.getElementById('legend').style.visibility = 'hidden'; 
	} else { 
		if (document.layers) { // Netscape 4 
			document.hideshow.visibility = 'hidden'; 
		} else { // IE 4 
			document.all.hideshow.style.visibility = 'hidden'; 
		} 
	} 
}

function showDiv() { 
	if (document.getElementById) { // DOM3 = IE5, NS6 
		document.getElementById('legend').style.visibility = 'visible'; 
	} else { 
		if (document.layers) { // Netscape 4 
			document.hideshow.visibility = 'visible'; 
		} else { // IE 4 
			document.all.hideshow.style.visibility = 'visible'; 
		} 
	} 
} 

function switchDiv() {
	if (document.getElementById("legend").style.visibility == "visible")
		document.getElementById("legend").style.visibility = "hidden";
	else {
		document.getElementById("legend").style.visibility = "visible";
	}
}