function isArray(object) {
  if (!window.Array) return false;
  else return object.constructor == window.Array;
}
function toggleLayer( whichLayer )
{
  var elem, vis;
  if( document.getElementById ) // this is the way the standards work
    elem = document.getElementById( whichLayer );
  else if( document.all ) // this is the way old msie versions work
      elem = document.all[whichLayer];
  else if( document.layers ) // this is the way nn4 works
    elem = document.layers[whichLayer];
  vis = elem.style;
  // if the style.display value is blank we try to figure it out here
  if(vis.display==''&&elem.offsetWidth!=undefined&&elem.offsetHeight!=undefined)
    vis.display = (elem.offsetWidth!=0&&elem.offsetHeight!=0)?'block':'none';
  vis.display = (vis.display==''||vis.display=='block')?'none':'block';
}

function togglesundfgroups( showlayer )
{
	hide_groups = new Array("starttext","betreuung", "consulting", "einkauf","fortbildung", "personal","planung","qm","stars","sundf_buy","sundf_sale");
	for (var i = 0; i < hide_groups.length; i++) {
		obj = document.getElementById(hide_groups[i]);        if (obj != null)   {   	obj.style.display = 'none'; }
	}
	obj = document.getElementById(showlayer);        if (obj != null)   {   	obj.style.display = 'block'; }
}