function setVisibility(rowName) {
	// Tabellenzelle ermitteln
	
	var actualVisibility=document.getElementById(rowName).style.visibility;

	if(actualVisibility=='visible') {
		document.getElementById(rowName).style.visibility = "hidden";
		document.getElementById(rowName).style.display = "none";
	} else {
		document.getElementById(rowName).style.visibility = "visible";
		document.getElementById(rowName).style.display = "block";
	}
}