function toggleOn(element) {
  document.getElementById('toggle_'+element).style.display='block';
  var elements = ['announcements','news','lectures'];
  elements_length = elements.length;
  for(i=0;i<elements_length;i++) {
    if(elements[i]!=element) {
      document.getElementById('toggle_'+elements[i]).style.display='none';
    }
  }
  fleXenv.initByClass("flexcroll");
}

function colorOn(tab) {
  document.getElementById('color_'+tab).style.background='#B54A60';
  var tabs = ['announcements','news','lectures'];
  tabs_length = tabs.length;
  for(i=0;i<tabs_length;i++) {
    if(tabs[i]!=tab) {
      document.getElementById('color_'+tabs[i]).style.background='transparent';
    }
  }
}