function hidediv1() {
		if (document.getElementById) { // DOM3 = IE5, NS6
			document.getElementById('subnav1').style.visibility = 'hidden';
		} 
	}
	
	function showdiv1() {
		if (document.getElementById) { // DOM3 = IE5, NS6
			document.getElementById('subnav1').style.visibility = 'visible';
		} 
	}