var state = 'none';

function showhide(layer_ref) {

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;
}
}