function turn_on(x){
	eval('document.getElementById("' + x + '").style.visibility = "visible"');
}

function turn_off(){
	document.getElementById("ladn").style.visibility = "hidden";
	document.getElementById("lbpt").style.visibility = "hidden";
	document.getElementById("tdb").style.visibility = "hidden";
	document.getElementById("ivdb").style.visibility = "hidden";
	document.getElementById("sbs").style.visibility = "hidden";
	document.getElementById("rdf").style.visibility = "hidden";
	document.getElementById("sgvt").style.visibility = "hidden";
	document.getElementById("psn").style.visibility = "hidden";
	document.getElementById("wdn").style.visibility = "hidden";
		
}