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