function showHide(layer_ref) {

	var state = 'none';
	var states = 'none';

	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");
		eval( "document.all.t" + layer_ref + ".style.display = state");
		eval( "document.all.s" + layer_ref + ".style.display = states");
	}

	if (document.layers) { //IS NETSCAPE 4 or below
		document.layers[layer_ref].display = state;
	}

	if (document.getElementById && !document.all) {
		meckaCH = document.getElementById(layer_ref);
		meckaCH.style.display = state;

		meckaCH = document.getElementById("t"+layer_ref);
		meckaCH.style.display = state;

		meckaCHs = document.getElementById("s"+layer_ref);
		meckaCHs.style.display = "none";
	}
}