<div style="text-align: center;">
 <input type="hidden" name="block_pbltool_strict" value="0" />
 <input type="checkbox" name="block_pbltool_strict" value="1"
   <?php if(!empty($CFG->block_pbltool_strict))
             echo 'checked="checked"'; ?> />
   <?php print_string('donotallowhtml', 'block_pbltool'); ?>
 <p>
 <input type="submit" value="<?php print_string('savechanges'); ?>" />
 </p>
</div>
