text: console.log('app is alive');
  
  // writes the name of the clicked channel on the app bar
  function switchChannel(channelName) {
      console.log('Tuning into channel' + channelName);
      document.getElementById('#chat').innerHTML=channelName;
  };
  
  // changes star from filled to empty
  function starChange(){
      $.('#star').html(src="http://ip.lfe.mw.tum.de/sections/star-o.png");
  }
  
  // changes star from empty to filled
  function starChangeBack(){
      $.('#star').html(src="http://ip.lfe.mw.tum.de/sections/star.png");
  }
  
  // switches between the tab buttons: add and remove .selected
  function selectTab(tabId){
  
  }
  