Add a class 'pt' to every tools, so it will be easy to search all these tools and remove them.
<div id="tasks_tb">
<a href="javascript:void(0)" class="pt icon-insert" title="Insert"></a>
<a href="javascript:void(0)" class="pt icon-change" title="Change"></a>
<a href="javascript:void(0)" class="pt icon-delete" title="Delete"></a>
<a href="javascript:void(0)" class="pt icon-reload" title="Reload"></a>
</div>
To remove these tools, simply call $('.pt').remove().