var state = 'none';
		function showhide(layer_ref) {
			if (state == 'block') { 
				state = 'none'; 
			} 
			else { 
				state = 'block'; 
			} 
			if (document.all) { //IS IE 4 or 5, 6 or 7  
				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; 
			} 
		}