<div class="ui-buttonset" style="float: right;">
<b>Период:</b>
<p>
<select id="ui-id-1" name="period" style="display: none;">
<span id="ui-id-1-button" class="ui-selectmenu-button ui-widget ui-state-default ui-corner-all">
</span>
</p>
</div>
///////вставить сюда
<div class="ui-buttonset">
form
.find('[name=period]')
.next("</div>")
.append(' <p ></p>')