/**
 * "Yet Another Multicolumn Layout" - (X)HTML/CSS Framework
 *
 * Workaround für IE8 und Webkit browser, 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
 *                  Many thanks to Mathias Schäfer (http://molily.de/) for his code improvements
 *
 * @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         3.3
 * @revision        $Revision: 466 $
 * @lastmodified    $Date: 2010-09-14 21:19:30 +0200 (Di, 14 Sep 2010) $
 */
 
(function () {
    var YAML_focusFix = { 
        skipClass : 'skip',
        
        init : function () {
            var userAgent = navigator.userAgent.toLowerCase();
            var is_webkit = userAgent.indexOf('webkit') > -1;
            var is_ie = userAgent.indexOf('msie') > -1;
            
            if (is_webkit || is_ie) {
                var body = document.body,
                    handler = YAML_focusFix.click;
                if (body.addEventListener) {
                    body.addEventListener('click', handler, false);
                } else if (body.attachEvent) {
                    body.attachEvent('onclick', handler);
                }
            }
        },
        
        click : function (e) {
            e = e || window.event;
            var target = e.target || e.srcElement;
            var tag_name = target.tagName || target.nodeName;
            if (target.className.indexOf(YAML_focusFix.skipClass) > -1 && tag_name.toLowerCase() === 'a') {
                YAML_focusFix.focus(target);
            }
        },
        
        focus : function (link) {
            var href = link.href,
                id = href.substr(href.indexOf('#') + 1),
                target = document.getElementById(id);
            if (target) {
                target.setAttribute("tabindex", "-1");
                target.focus();
            }
        }
    };
    YAML_focusFix.init();
})();