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 ShowLayer(which)
{
	document.getElementById('kontakt').style.display = 'none';
	document.getElementById('person').style.display = 'none';
	document.getElementById('konzept').style.display = 'none';
	document.getElementById('beratung').style.display = 'none';
	document.getElementById('vortraege').style.display = 'none';
	document.getElementById('impressum').style.display = 'none';
	document.getElementById('informatives').style.display = 'none';
	
	
	toggleLayer(which)
}

function BlurLinks(){ 
	var a = document.getElementsByTagName('a'); 
	var x = a.length; 
	
	for(i=0;i<x;i++){ 
	a[i].onfocus = new Function("this.blur();"); 
	} 
}