function flip(breakfeat){
      // hide intro text
    	document.getElementById('introtext').style.display = "none";
    	// hide all infos (<p class="breakfeat">bla</p>)
    	document.getElementById('bttext').style.display = "none";
    	document.getElementById('tfltext').style.display = "none";
    	document.getElementById('ergontext').style.display = "none";
   	
      // show current infotext
    	document.getElementById(breakfeat).style.display = "block";
    }
    
    function hidestuff() {
      /* document.getElementById('btimg').style.display = "none";
      document.getElementById('tflimg').style.display = "none";
      document.getElementById('ergonimg').style.display = "none";
      document.getElementById('disclaimernojs').style.display = "none";
      document.getElementById('introtextnojs').style.display = "none"; */   
      document.getElementById('introtext').style.display = "block";
      
      // hide non-Javascript collaborator <img>s 
      document.getElementById('btimg').style.display = "none";
      document.getElementById('tflimg').style.display = "none";      
      document.getElementById('ergonimg').style.display = "none";      
    }
    
    function disclaim(state) {
      if(state=='off') {
        document.getElementById('disclaimerbox').style.display = "none";
      } else {
        document.getElementById('disclaimerbox').style.display = "block";        
      }
    }
    
    function turnon(which) {
      document.getElementById(which).src = "_img/banner_" + which + ".png";
    }
    function turnoff(which) {
      document.getElementById(which).src = "_img/banner_" + which + "-off.png";    
    }

function NewPage() {
  if(!document.getElementsByTagName ) { return; }
  var anchors = document.getElementsByTagName( "a" );
  for( var loop = 0; loop < anchors.length; loop++ ) {
    var anchor = anchors[ loop ];
    if( anchor.getAttribute( "href" ) && anchor.getAttribute( "rel" ) == "external" ) {
      anchor.target = "_blank";
    }
  }
}