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<!-- Example working on IE, Firefox and Opera -->
<a href="#" onclick="createBookmark('Example', 'http://example.com', this);">Test</a>

<!-- Example working on IE and Firefox -->
<script>
  createBookmark('Example', 'http://example.com');
</script>

/**
 * Creates a bookmark
 *
 * @param {String} title
 *  Title to use for the bookmark
 * @param {String} url
 *  Url to use for the bookmark
 * @param {HTMLAnchorElement} [link=null]
 *  Optional bookmark anchor element that has been clicked
 *  (necessary because of opera's security policy)
 */
function createBookmark(title, url, link) {
  if (window.sidebar) {
    // firefox
    window.sidebar.addPanel(title, url, '');
  } else if (window.external && document.all) {
    // ie
    window.external.AddFavorite(url, title);
  } else if (window.opera && link) {
    // opera
    link.setAttribute('href', url);
    link.setAttribute('title', title);
    link.setAttribute('rel', 'sidebar');
  } else {
    // chrome and co.
    alert("Press Control + D to bookmark");
  }
}