var state = 'none';

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