php - Strange behaviour in hierarchical menu? -

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the function simple:

 function showmenu( $level = 0 ) {      $sql = "select * `menus` `submenu`=".$level;      $result = mysql_query( $sql );      echo "<ul>";          while ( $node = mysql_fetch_array( $result ) ) {              echo "<li>". $node['name'];              $sql_ = "select * `menus` `submenu`=".$node['id'];              $haschild = mysql_fetch_array( mysql_query( $sql_ ) ) != null;              if ( $haschild ) {                  showmenu( $node['id'] );              }              echo "</li>";          }      echo "</ul>";   }

but results when i'm using level 1 or on strange. example: 

showmenu( 1 );

will return me items, except first items.

function showmenu( $level = 0 ) {      $sql = "select * `menus` `submenu`=".$level;      $result = mysql_query( $sql );      echo "<ul>";       $rows = "";         while ( $node = mysql_fetch_array( $result ) ) {              echo "<li>". $node['name'];              $sql_ = "select * `menus` `submenu`=".$node['id'];              $execute = mysql_query( $sql_ );              $rows = mysql_num_rows($execute);             if ( $rows>0 ) {                  showmenu( $node['id'] );              }              echo "</li>";          }      echo "</ul>";   }

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