[TYPO3-english] Need typoscript help

[PIT Solutions]

Hi,

I've a main menu typoscript,

lib.mainmenu = HMENU
lib.mainmenu.special = directory
lib.mainmenu.special.value = 4
lib.mainmenu.1 = TMENU
lib.mainmenu.1{
     wrap = <ul>|</ul>
     NO {
    stdWrap.htmlSpecialChars = 1
    allWrap = <li>|</li>|*|<li>|</li>|*|<li class="last">|</li>
  }

}

This is working. But my requirement is, I need to wrap a <span> tag inside the <li> tag if subpage of that page exists.
For example, I've 3 pages and the second page has subpages, then the html should be,

<ul>
<li>
<a>Test 1</a>
</li>
<li>
<a>Test 2</a>
<span></span>
</li>
<li class="last">
<a>Test 3</a>
</li>
</ul>

Here I 've subpages for Test 2 page. In this case I need to place a span stag inside that <li>.

I've tried some configurations based on this tutorial http://typo3.org/documentation/snippets/sd/219/, but not working.

Please help, Thanks.
Arun Chandran