for my $i ( 0 .. $#$sqldata ) {
   if ($sqldata->[$i]{under} == 0 ) {
      push (@tree, $sqldata->[$i]);
   }
   for my $j ( 0 .. $#$sqldata ) {
      if ($sqldata->[$j]{under} == $sqldata->[$i]{pageid} && $sqldata-
+>[$j]{level} == 2) {
         $sqldata->[$j]{tab} = 1; 
         push (@tree, $sqldata->[$j]);
         
         for my $k ( 0 .. $#$sqldata ) {
            if ($sqldata->[$k]{under} == $sqldata->[$j]{pageid} && $sq
+ldata->[$k]{level} == 3) {
               $sqldata->[$k]{tab} = 2;
               push (@tree, $sqldata->[$k]);
               
               for my $l ( 0 .. $#$sqldata ) {
                  if ($sqldata->[$l]{under} == $sqldata->[$k]{pageid} 
+&& $sqldata->[$l]{level} == 4) {
                     $sqldata->[$l]{tab} = 3;
                     push (@tree, $sqldata->[$l]);
                  }
               }
            }
         }
      }
   }
}