function $(element)
{
  return document.getElementById(element);
}

function confirmDelete()
{
  return confirm('Are you sure you want to delete this?');
}

function showElement(element,mode)
{
  if (!mode)
  {
    mode = 'block';
  }
  if (mode == 'visible')
  {
    $(element).style.visibility = mode;
  }
  else
  {
   $(element).style.display = mode;
  }
}

function hideElement(element,mode)
{
  if (!mode)
  {
    var mode = 'none';
  }
  if (mode == 'hidden')
  {
    $(element).style.visibility = mode;
  }
  else
  {
    $(element).style.display = mode;
  }
}

function changeElementClass(element,classname)
{
  $(element).className = classname;
}