// Funktion zur Referenzierung von Div-Layern
function div_ref (id)
{
	if  (document.layers)
		return document.layers[id]; // NC 4
	else
		if (document.all)
			return document.all[id]; // IE 4
    	else
			if (document.getElementById)
				return document.getElementById(id); // DOM
			else
				return null;        
}
  
// Funktion zur Referenzierung von Div-Layern mit Zugriff auf CSS-Eigenschaften
function div_ref_style (id)
{
	if (document.layers)
	{
		obj = document.layers[id]
		return (obj ? document.layers[id] : null);
	}
	else
		if (document.all)
		{
			obj = document.all[id];
			return (obj ? obj.style : null);
		}
		else
			if (document.getElementById)
			{
				obj = document.getElementById(id);
				return (obj ? obj.style : null);
			}
			else
				return null;        
}
  
function show_menu(nID, bVisible)
{
	if (bVisible)
		for (nTempID = 110; nTempID <= 140; nTempID += 10)
			if (nTempID != nID)
				div_ref_style("menu_" + nTempID).visibility = "hidden";
		
	div_ref_style("menu_" + nID).visibility = (bVisible ? "visible" : "hidden");
}

function show_office_address(strType)
{
	bVisible = (div_ref("_buero_" + strType).style.display == "" ? true : false);
	div_ref("_buero_" + strType).style.display = (bVisible ? "none" : "");
	return false;
}