function toogle_display(b) {
  var c;
  c = document.getElementById('content_'+b.id);
  if(c.style) {
    c.style.display = (c.style.display == '') ? 'none' : '';    
    b.innerHTML = (c.style.display == '') ? 'Hide' : 'Show';
    b.style.background = (c.style.display == '') ? '#ff8080' : '#80ff80';
  }  
}