var state = '';

function showhide(layer_ref) {
	
	
if (document.all) { //IS IE 4 or 5 (or 6 beta)
	eval("state = document.all." + layer_ref + ".style.display");
}
if (document.layers) { //IS NETSCAPE 4 or below
	state = document.layers[layer_ref].display;
}
if (document.getElementById && !document.all) {
	maxwell_smart = document.getElementById(layer_ref);
	state=maxwell_smart.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) {
	maxwell_smart = document.getElementById(layer_ref);
	maxwell_smart.style.display = state;
}
}
function hideall() {
for(i=1;i<16;i++)
{
	layer_ref = 'cat'+i;
	state = 'none';
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) {
	maxwell_smart = document.getElementById(layer_ref);
	maxwell_smart.style.display = state;
}
}
}