jQuery Plugin to highlight occurrences of a word

gistfile1.txt

    $.fn.showKeywords = function(kwds) {
        kws = kwds || [];
        if (!$.isArray(kwds) || kwds.length === 0) return this;

        var str = $.trim(kwds.join('|'));
        if (str.length === 0) return this;

        var regex = new RegExp('\\b('+str+')\\b', 'gim');
        this.each(function() {
            var children = $(this).children();
            if (children.length > 0) {
                children.showKeywords(kwds);
            } else {
                var html = $(this).html();
                html = html.replace(regex, '<em class="occurence">\$1</em>');
                $(this).html(html);
            }            
        });
        return this;
    };

gistfile2.txt

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