/**
 * "Yet Another Multicolumn Layout" - (X)HTML/CSS Framework
 *
 * (en) Workaround for Webkit browsers to fix focus problems when using skiplinks
 * (de) Workaround für Webkit browsers, um den Focus zu korrigieren, bei Verwendung von Skiplinks
 *
 * @note      inspired by Paul Ratcliffe's article
 *          http://www.communis.co.uk/blog/2009-06-02-skip-links-chrome-safari-and-added-wai-aria
 *
 * @copyright       Copyright 2005-2010, Dirk Jesse
 * @license         CC-A 2.0 (http://creativecommons.org/licenses/by/2.0/),
 *                  YAML-C (http://www.yaml.de/en/license/license-conditions.html)
 * @link            http://www.yaml.de
 * @package         yaml
 * @version         3.2.1
 * @revision        $Revision: 711 $
 * @lastmodified    $Date: 2010-03-15 19:45:06 +0100 (Mo, 15 Mrz 2010) $
 */

var YAML_focusFix = {
  init: function() {

    var userAgent = navigator.userAgent.toLowerCase();
    var is_webkit = userAgent.indexOf('webkit') > -1;
    var is_ie = userAgent.indexOf('msie') > -1;
    var i = 0;
    var links, skiplinks = [];

    if (is_webkit || is_ie)
    {
      // find skiplinks in modern browsers ...
      if ( document.getElementsByClassName !== undefined) {
        skiplinks = document.getElementsByClassName('skip');

        for (i=0; i<skiplinks.length; i++) {
          this.setTabIndex(skiplinks[i]);
        }
      } else {
        // find skiplinks in older browsers ...
        links = document.getElementsByTagName('a');
        for (i=0; i<links.length; i++) {
          var s = links[i].getAttribute('href');
          if (s && s.length>1 && s.substr(0, 1)=='#') {
            this.setTabIndex(links[i]);
          }
        }
      }
    }
  },

  setTabIndex: function( skiplink ){
    var target = skiplink.href.substr(skiplink.href.indexOf('#')+1);
    var targetElement = document.getElementById(target);

    if (targetElement !== null) {
      // make element accessible for .focus() method
      targetElement.setAttribute("tabindex", "-1");
      skiplink.setAttribute("onclick", "document.getElementById('"+target+"').focus();");
    }
  }
};

YAML_focusFix.init();