function togglePanel(objID)
{ var myPanel        = document.getElementById(objID); 
  var myPanelHeadImg = document.getElementById(objID+'HeadImg'); 
  if (myPanel.style.display == "none")
  { myPanel.style.display = "block";
    myPanelHeadImg.src = "images/minus.gif";
  } else
  { myPanel.style.display = "none";
    myPanelHeadImg.src = "images/plus.gif";
  }
}