Dropdown_Menu_with_Ditto

Hello i need a simple dropdown menu .. im using this:



http://wiki.modxcms.com/index.php/Dropdown_Menu_with_Ditto



the menu is showed but not jumping the link

i got this:

<option value="[~[+id+]~]">[+pagetitle+]</option>

in a chunk named dropdown

and this:

<script language="JavaScript">
function jumpTo(selObj){
thevalue = selObj.options[selObj.selectedIndex].value;
if (thevalue != 0) window.location= thevalue;
return false
}
</script>
<form action="#" onsubmit="return false" method="post">
<select name="goto" onChange="jumpTo(this);">
[!Ditto? &parents=`56` &tpl=`dropdown` &display=`100` &total=`100` &sortBy=`pagetitle` &sortDir=`ASC`!]
</select>
</form>

in the template

please some help!!!!

thanks a lot

<m