function showhide(layer_ref) {
			
			var state = document.getElementById(layer_ref).style.display;
			
			if (state == 'block') {
				state = 'none';
			}	else {
				state = 'block';
			}
			if (document.all) { //IS IE 4 or 5 (or 6 beta)
				eval( "document.all." + layer_ref + ".style.display = state");
			}
			if (document.layers) { //IS NETSCAPE 4 or below
				document.layers[layer_ref].display = state;
			}
			if (document.getElementById &&!document.all) {
				hza = document.getElementById(layer_ref);
				hza.style.display = state;
			}
		}

		function showHideManual(layer_ref, state) {

			if (document.all) { //IS IE 4 or 5 (or 6 beta)
				eval( "document.all." + layer_ref + ".style.display = state");
			}
			if (document.layers) { //IS NETSCAPE 4 or below
				document.layers[layer_ref].display = state;
			}
			if (document.getElementById &&!document.all) {
				hza = document.getElementById(layer_ref);
				hza.style.display = state;
			}
		}