function toggleWindow(layerRef) {
	if ( typeof(layerRef) == 'string')
		layerRef = document.getElementById(layerRef);
	oldstyle = layerRef.style.display;
	if (oldstyle == 'none' || oldstyle == '')
		layerRef.style.display = 'block';
	else {
		layerRef.style.display = 'none';	
	}
}