<!--
 // Toggles visibility of an element on the page.
    function toggle_visibility(id, thisImage) {
       var e = document.getElementById(id);
       if(e.style.display == 'block') {
          e.style.display = 'none'; 
		  document.images[thisImage].src = '/images/icons/plus.gif';
		  }
       else {
          e.style.display = 'block';
		  document.images[thisImage].src = '/images/icons/minus.gif';
		  }
    }
//-->