function hidediv() {
	document.getElementById("nav-damp-proofing").style.color = "#e9e9e9";
	document.getElementById("nav-damp-proofing").style.backgroundImage = "";
	if (document.getElementById) { // DOM3 = IE5, NS6
		document.getElementById('subnav-container').style.visibility = 'hidden';
	} 
}

function showdiv() {
	document.getElementById("nav-damp-proofing").style.color = "#ffffff";
	document.getElementById("nav-damp-proofing").style.backgroundImage = "url(images/misc/nav-bg-on.jpg)";
	if (document.getElementById) { // DOM3 = IE5, NS6
		document.getElementById('subnav-container').style.visibility = 'visible';
	} 
}