var toggledNumbers = new Array();
		toggledNumbers[0] = 'what-content';
		toggledNumbers[1] = 'who-content';
		toggledNumbers[2] = 'how-content';

var toggledDisplay = new Object();
    toggledDisplay[toggledNumbers[0]] = true;
    toggledDisplay[toggledNumbers[1]] = true;
    toggledDisplay[toggledNumbers[2]] = true;

function toggleDisplay(bDisplayed){
  if(!document.getElementById || toggleDisplay.arguments.length < 2) return;
  var displayed = new Object();
      displayed['true'] = 'block';
      displayed['false'] = 'none';
  for(var i = 1; i < toggleDisplay.arguments.length; i++){
    oDisplay = document.getElementById(toggleDisplay.arguments[i]);
    if(oDisplay){
      oDisplay.style.display = displayed[bDisplayed];
      // mozilla is the only browser out of the lot that can't get this right.  so, if we're
      // setting an object's display style to block, we gotta reload any images contained
      // within that block.  mozilla won't do it for you like every other browser that
      // supports the functionality of changing the display style dynamically.
      // begin crap browser hack
      if(bDisplayed){
        oImages = oDisplay.getElementsByTagName('IMG');
        for(var j = 0; j < oImages.length; j++)
          oImages[j].src = oImages[j].src;
      }
      // end mozilla, err, crap browser hack
       if(typeof toggledDisplay[toggleDisplay.arguments[i]] != 'undefined')
				// Umstellen des gespeicherten Zustandes
        toggledDisplay[toggleDisplay.arguments[i]] = !bDisplayed;
				// 
    }
  }
}

function toggleNavigation(bDisplayed){
	toggleDisplay(false, 'who-content', 'what-content', 'how-content');
	toggleDisplay(toggledDisplay[bDisplayed], bDisplayed)
}