/* hidden / show Boxes */
function twist( sid )
{
  imgobj = document.getElementById( "img_"+sid );
  divobj = document.getElementById( sid );
  if ( imgobj.src.match( "show.gif" ) )
  {
    imgobj.src = "img/hide.gif";
    divobj.style.position = "relative";
    divobj.style.visibility = "visible";
  }
  else
  {
    imgobj.src = "img/show.gif";
    divobj.style.visibility = "hidden";
    divobj.style.position = "absolute";
  }
}