function showPanel(num)
{
  stl = document.getElementById("t"+num).style;
  img = document.getElementById("i"+num);
  if ( ( stl.display=='none' ) || ( stl.display=='' ) )
        {
	  stl.display = 'inline';
	  img.src="../images/done.gif";
	}
	else{ stl.display = 'none'; img.src="../images/blt.gif"; }
  return false;
}