cpts[0] = ['BASIC', 'BugAssistant', 'Chart', 'contrib', 'Database', 'Documentation', 'Drawing', 'Extensions', 'Formula editor', 'Installation', 'Libreoffice', 'Linguistic', 'Localisation', 'Printing and PDF export', 'Presentation', 'Spreadsheet', 'UI', 'Writer', 'WWW' ];
<select name="product" multiple="multiple" size="5" id="product"
                      <option value="LibreOffice" selected>LibreOffice</option>
</select>