function anzeigen(das) {
 if (document.getElementById(das).style.display=='none') {
  document.getElementById(das).style.display='block';
 }
 else {
  document.getElementById(das).style.display='none';
 }
}

function verbergen(das) {
  document.getElementById(das).style.display='none';
}

function preloadImages() 
{
    var i = 0;
    imageObj = new Image();
    
 	// set image list and preload
    images = new Array();
    for (i=0; i <= 13; i++)
	{	
		images[i] = "images/praxis/praxis-"+i+".jpg";
		imageObj.src = images[i];
	}
} 

function showImage(nummer)
{
	document.getElementById("praxisbild").src="images/praxis/praxis-" + nummer + ".jpg";
}