Use close icon for dialog window close

include/staff/templates/collaborator.tmpl.php

 <h3>Update Collaborator: <?php echo $collaborator->getName(); ?></h3>
-<b><a class="close" href="#">&times;</a></b>
+<b><a class="close" href="#"><i class="icon-remove-circle"></i></a></b>
 <?php
 if($errors && $errors['err']) {
     echo sprintf('<div><p id="msg_error">%s</p></div>', $errors['err']);

include/staff/templates/collaborators.tmpl.php

 <h3>Ticket Collaborators</h3>
-<b><a class="close" href="#">&times;</a></b>
+<b><a class="close" href="#"><i class="icon-remove-circle"></i></a></b>
 <?php
 if($info && $info['msg']) {
     echo sprintf('<p id="msg_notice" style="padding-top:2px;">%s</p>', $info['msg']);