function showdis(inhalt,layer) 
{
	if (document.getElementById(layer).style.visibility == "hidden" || !document.getElementById(layer).style.visibility ) {
	document.getElementById(layer).style.visibility = "visible";
	document.getElementById(layer).innerHTML = inhalt;
	return;
	}
}
function hidedis(layer)
{
if (document.getElementById(layer).style.visibility == "visible") {
	document.getElementById(layer).style.visibility = "hidden";
	document.getElementById(layer).innerHTML = "";
	return;
	}
}