function toggle(id) {
	//safe function to hide an element with a specified id
	if (document.getElementById) { // DOM3 = IE5, NS6
		var el = document.getElementById(id);
		el.style.display = (el.style.display != 'none' ? 'none' : '' );	
	}
	else {
		if (document.layers) { // Netscape 4
			document.id.display = (document.id.display != 'none' ? 'none' : '');
		}
		else { // IE 4
			document.all.id.style.display = ( document.all.id.style.display != 'none' ? 'none' : '');
		}
	}
}