if (! WORDTRACKER) var WORDTRACKER = {};
WORDTRACKER.FreeKeywordsPlugin = new function () {
    var text = 'Wordtracker Keywords';
    var name = 'freekeywords';
    var base = 'http://freekeywords.wordtracker.com/';
    var plugin_url = base + 'plugin/' + name + '.xml';
    var image_url = base + 'plugin/' + name + '.png';
    var cat = 'Research';
    
    function addEngine (plugin_url, image_url, name, cat) {
        if ((typeof window.sidebar == "object") && (typeof  window.sidebar.addSearchEngine == "function")) {
            window.sidebar.addSearchEngine(plugin_url, image_url, name, cat);
        } else if ((typeof window.external == "object")) {
            window.external.AddSearchProvider(plugin_url);
        } else {
            return true;
        }
        return false;
    }
    
    this.add = function () {
        return addEngine(plugin_url, image_url, name, cat);
    }
    
    document.write('<a href="' + plugin_url + '" onclick="return WORDTRACKER.FreeKeywordsPlugin.add()" style="white-space:nowrap;"><img src="' + image_url + '" alt="" style="vertical-align:middle; border:none;" />&nbsp;' + text + '</a>');
};