<!--

  // for caching purposes
  var ZIPPED_URL = "zipped_triangle.gif";
  var UNZIPPED_URL = "unzipped_triangle.gif"

  image1 = new Image();
  image1.src = UNZIPPED_URL;

  function dropInfo(blockId, otherId, opt_image, opt_otherImage, opt_callback) {
    var blockNode = document.getElementById(blockId);
    if (blockNode.style.display == 'block'){
      blockNode.style.display = 'none';
      if (opt_image) {
        opt_image.src = ZIPPED_URL;
      }
      if (opt_callback) {
        opt_callback(blockId, false);
      }
    } else {
      blockNode.style.display='block';
      if (opt_image) {
        opt_image.src = UNZIPPED_URL;
      }
      var otherNode = document.getElementById(otherId);
      if (otherId != 'none'){
        if (otherNode.style.display == 'block') {
          otherNode.style.display = 'none';
          if (opt_otherImage) {
            opt_otherImage.src = ZIPPED_URL;
          }
        }
      }
      if (opt_callback) {
        opt_callback(blockId, true);
      }
    }
  }

//-->