active

active - Specifies the zero-based index of the active tab. If not specified, the first one will be selected.

If false i set and collapsible is set, no tab will be active initially.

<div id="tabs">
    <ul>
        <li>One</li>
        <li>Two</li>
    </ul>
    <div>Tab Pane 1</div> 
    <div>Tab Pane 2</div>
</div>

<script type="text/javascript">
    $(function () {
        $("#tabs").shieldTabs({
            active: 1 // the second tab will be set as active
        });
    });
</script>