function changeText(name)
{
   var v = document.getElementById('changingtext');
   var w = v.getElementsByTagName('div');
   for (var i=0; i<w.length; i++)
      if (w[i].id != "")
         w[i].style.display = 'none';

   var x = document.getElementById(name);
   x.style.display = 'block';
}