function submenu(layer,property)
{
	lyrObj = document.getElementById(layer);
	if(property == "logical")
	{
		if(lyrObj.style.visibility == "visible")
			lyrObj.style.visibility = "hidden";
		else
			lyrObj.style.visibility = "visible";
	}
	else
	{
		lyrObj.style.visibility = property;
	}
}