document.write('<form method="get" action="http://www.google.es/search" class="formBuscar">');
document.write('<input type="text" name="q" id="busquedas" size="15" maxlength="255" class="form01" value="" />');
document.write('<input type=hidden name=domains value="unav.es/SI">');
document.write('<input type=hidden name=sitesearch value="unav.es/SI" checked>');
document.write('<input type="submit" name="btnG" value="Buscar" class="form02" />');
document.write('</div></form>');