How to check value in multidimensional array

Hi guys, I have an array with navigation items like that: $navigationItemArr = array("Home"=>"home",

                 "Profile"=>"profile",
                 "Photogallery"=>"photogallery",
                 "Contact"=>array("contact","subsection")
                 );

How can I check for a value in this array? I tried something like this: . . ..for.... $i++.. { // there is a normal for cycle, this is just an illustration . .

       if(in_array($bodyVariablePiece[$i], $navigationItemArr)) {
           echo "$bodyVariablePiece[$i] [$i] - ok<br />";
       }
       else {
           echo "$bodyVariablePiece[$i] [$i] - error<br />";
       }

. . } . . * in $bodyVariablePiece are values extracted from URL like - home, profile, photogallery, contact Everything works except contact - there it show error. So what is the correct way to check values in multidimensional arrays? Is it possible with in_array() function? Thanks, Erik