midcom - photo gallery

Hi, 
 
I got strange problem. I got several galleries and have th efollowing code
for next/previous links:
 
<?
 
  $leaves =
$GLOBALS["midcom_site"]["nap"]->list_leaves($GLOBALS["midcom_site"]["nap"]->
get_current_node());
  if (is_array($leaves) && count($leaves) > 0) {
    $cnt=count($leaves);
    for($i=0;$i<$cnt;$i++){
      $leaf = $GLOBALS["midcom_site"]["nap"]->get_leaf($leaves[$i]);
      if($leaf[MIDCOM_NAV_NAME]==$data["name"]){
 
       if($prev=$GLOBALS["midcom_site"]["nap"]->get_leaf($leaves[$i-1]))
        $prevlink="<a href=\"".$prefix.$prev[MIDCOM_NAV_NAME]."\">".
                  "<img
src=\"/attachment/0847915551ae95029416708b61c6fc8d/8a6ed16d2365aee54e05a4e2f
f52d812/przycisk_poprzednie.gif\" width=100 height=36 alt=\"\"
border=\"0\">".
                  "</a>";
       else
        $prevlink="<img
src=\"/attachment/0847915551ae95029416708b61c6fc8d/0284d66cb0f35bfc74707bfa1
bf27035/spacer.gif\" width=100 height=1 alt=\"\">";
 
       if($next=$GLOBALS["midcom_site"]["nap"]->get_leaf($leaves[$i+1]))
        $nextlink="<a href=\"".$prefix.$next[MIDCOM_NAV_NAME]."\">".
                  "<img
src=\"/attachment/0847915551ae95029416708b61c6fc8d/a5ba8dad445935ef1a1c031a2
b7c3d9a/przycisk_nastepne.gif\" width=100 height=36 alt=\"\" border=\"0\">".
                  "</a>";
       else
        $nextlink="<img
src=\"/attachment/0847915551ae95029416708b61c6fc8d/0284d66cb0f35bfc74707bfa1
bf27035/spacer.gif\" width=100 height=1 alt=\"\">";
      }
    }
  }
?>
 
for one of galleries I dont get $leaves array and the navi part is not then
executed. But why? It is same gallery as the others...
 
Solt