check box re-population
http://24.91.157.113/findyourdesire/phpTest/control.php
click on interests. that's the section this is in, with some debugging lines added. 
i realized after adding that it's not my repopulation function, but the arrays. i just don't understand why the arrays are causing an issue.
(this is where the issue is.. this has been edited to remove the horizontal scroll)
<?php
function interest(){ # in interests
  include(\"/home/joshua/includes/fyd.vars.php\"); # includes file (precautionary measure)
  $result; $selections;
  if(isset($_POST['act'])){ # update the db
    $pw=$_COOKIE['pw']; $un=$_COOKIE['un'];
    /* connect to db. give error messages is pw doesn't match */
    /* update db with new selections (for interests that have selections) and then retrieve
 the new entries */
    /* make each interest intoit's own string, with html formatting and set $selections to it */
  }else{ # call the database and retrieve what's needed
    $pw=$_COOKIE['pw']; $un=$_COOKIE['un'];
    /* connect to db. give error messages is pw doesn't match */
    /* make each interest into it's own string, with html formatting and set $selections to it */
  }
  /* this has \"test selections\" in the arrays to test the function for cheching this */
  $cbooks=array('Comedy', 'Mystery', ''); $cmisc=array('Cars/Trucks', 'Religions', ''); 
  $cmovies=array('Action, Fantasy, Science-Fiction', ''); $cmusic=array('Blues', 'Techno', ''); 
  $cpets=array('Birds', 'Mice', 'Snakes', ''); $csports=array('Baseball', 'Fencing', 'Luge',
 'Tennis', '');
  $books=array('books'=>'Art','books'=>'Childrens','books'=>'Comedy','books'=>'Comic',
'books'=>'Cook/Cooking','books'=>'Fantasy','books'=>'Horror','books'=>'Mystery',
'books'=>'Picture','books'=>'Poetry','books'=>'Romance','books'=>'Science-Fiction',
'books'=>'Other');
  $misc=array('misc'=>'Aircraft (Commercial)','misc'=>'Aircraft (Military)',
'misc'=>'Cars/Trucks','misc'=>'Computer Games','misc'=>'Computer Hardware',
'misc'=>'Computer Programming','misc'=>'Occult','misc'=>'Religions',
'misc'=>'Role Playing Games (RPGs)','misc'=>'Other');
  $movies=array('movies'=>'Action','movies'=>'Animated','movies'=>'Comedy',
\"movies\"=>\"Children's (Disney)\",'movies'=>'Documentary','movies'=>'Drama','movies'=>'Fantasy',
'movies'=>'Foreign','movies'=>'Horror','movies'=>'Romance','movies'=>'Science-Fiction',
'movies'=>'Other');
  $music=array('music'=>'Blues','music'=>'Christian','music'=>'Classical',
'music'=>'Country/Western','music'=>'Dance','music'=>'Folk','music'=>'Gospel','music'=>'Jazz',
'music'=>'Opera','music'=>'Polka','music'=>'Pop','music'=>'Rap','music'=>'Rock',
'music'=>'Salsa','music'=>'Techno','music'=>'Other');
  $pets=array('pets'=>'Birds','pets'=>'Cats','pets'=>'Dogs','pets'=>'Fish','pets'=>'Gerbils',
'pets'=>'Hermit Crabs','pets'=>'Horses','pets'=>'Lizards','pets'=>'Mice','pets'=>'Rabbits',
'pets'=>'Rats','pets'=>'Snakes','pets'=>'Other');
  $sports=array('sports'=>'Baseball','sports'=>'Basketball','sports'=>'Curling',
'sports'=>'Dance','sports'=>'Fencing','sports'=>'Field Hockey','sports'=>'Fishing',
'sports'=>'Football','sports'=>'Gymnastics','sports'=>'Hockey','sports'=>'Ice Skating',
'sports'=>'Inline Skating','sports'=>'Luge','sports'=>'Martial Arts','sports'=>'Skate Boarding',
'sports'=>'Sky Diving','sports'=>'Snow Boarding','sports'=>'Soccer','sports'=>'Street Luge',
'sports'=>'Surfing','sports'=>'Swimming','sports'=>'Track & Field','sports'=>'Tennis',
'sports'=>'Volleyball','sports'=>'Other');
    $i=0; $j=0; $boxes=''; $done=FALSE; # keep track selection/cells; make choices; are we
 done?
  function checkopts($selections, $choices, $row){ # makes check box options
    $ssize=count($selections); $csize=count($choices); # size of the arrays
    $nnoc=(ceil($csize/$row)*$row); # how many cells do we need
    while(!($done)){
    foreach($choices as $key=>$value){
      if(($j%$row)==0){ $boxes.='            <tr>'; } # we're starting a row
      if($selections[$i]==$value){ # it was selected
    $boxes.='<td><input type=\"checkbox\" name=\"'.$key.\"[]\\" selected value=\\"$value\\">
 $value</td>\";
    $i++; # go to the next selection
      }else{ # it wasn't
    $boxes.='<td><input type=\"checkbox\" name=\"'.$key.\"[]\\" value=\\"$value\\"> 
$value</td>\";
      }
      if(($j%$row)==0){ $boxes.='</tr>\n'; } # we finished the row
      $j++; # we finished a cell, add to the number of cells
    }
    if($j<$nnoc){ # we don't have a complete row
      for($k=$j;$k<$nnoc;$k++){ # finish off the row with empty cells
    $boxes.='<td> </td>';
      }
      $boxes.='</tr>\n';
    }
    $done=TRUE;
    }
    return $boxes;
  }
  $bookboxes=checkopts($cbooks, $books, 7); $miscboxes=checkopts($cmisc, $misc, 4);
  $movieboxes=checkopts($cmovies, $movies, 6); $musicboxes=checkopts($cmusic, $music, 7);
  $petboxes=checkopts($cpets, $pets, 7); $sportboxes=checkopts($csports, $sports, 7);
  ## make the page
  echo <<<END
      <p>$result</p>
      <p>Your Current Selections: $selections (note check boxes populated with a \"sample
 selection array\" via a new function being tested)</p>
      <form action=\"$_SERVER[PHP_SELF]\" method=\"POST\">
    <input type=\"hidden\" name=\"fn\" value=\"interest\"><input type=\"hidden\" name=\"act\"
 value=\"process\">
    <table frame=\"void\" bgcolor=\"#000000\" text=\"#c8c8c8\" border=\"0\" cellpadding=\"0\"
 cellspacing=\"0\">
        <tr>
          <td colspan=\"2\" align=\"center\"><!-- inner table for interest: Books -->
        <table frame=\"box\" bgcolor=\"#000000\" border=\"1\" cellpadding=\"0\" cellspacing=\"0\"
 text=\"#c8c8c8\" width=\"100%\">
            <tr><th colspan=\"7\" >Please check off all Genres of Books that interest
 you</th></tr>
$bookboxes
        </table>
          </td>
        </tr>
        <tr>
          <td colspan=\"2\" align=\"center\"> <!-- inner table for interest: Misc-->
        <table frame=\"box\" bgcolor=\"#000000\" border=\"1\" cellpadding=\"0\" cellspacing=\"0\"
 text=\"#c8c8c8\" width=\"100%\">
            <tr><th colspan=\"4\">Please check off all Miscellaneous Interests that
 interest you</th></tr>
$miscboxes
        </table>
          </td>
        </tr>
        <tr>
          <td colspan=\"2\" align=\"center\"><!-- inner table for interest: Movies  -->
        <table frame=\"box\" bgcolor=\"#000000\" border=\"1\" cellpadding=\"0\" cellspacing=\"0\"
 text=\"#c8c8c8\" width=\"100%\">
            <tr><th colspan=\"6\">Please check off all Genres of Movies that interest
 you</th></tr>
$movieboxes
        </table>
          </td>
        </tr>
        <tr>
          <td colspan=\"2\" align=\"center\"><!-- inner table for interest: music -->
        <table frame=\"box\" bgcolor=\"#000000\" border=\"1\" cellpadding=\"0\" cellspacing=\"0\"
 text=\"#c8c8c8\" width=\"100%\">
            <tr><th colspan=\"7\">Please check off all Genres of Music that interest
 you</th></tr>
$musicboxes
        </table>
          </td>
        </tr>
        <tr>
          <td colspan=\"2\" align=\"center\"> <!-- inner table for interest: Pets-->
        <table frame=\"box\" bgcolor=\"#000000\" border=\"1\" cellpadding=\"0\" cellspacing=\"0\"
 text=\"#c8c8c8\" width=\"100%\">
            <tr><th colspan=\"7\">Please check off all Pets that interest you</th></tr>
$petboxes
        </table>
          </td>
        </tr>
        <tr>
          <td colspan=\"2\" align=\"center\"> <!-- inner table for interest: Sports-->
        <table frame=\"box\" bgcolor=\"#000000\" border=\"1\" cellpadding=\"0\" cellspacing=\"0\"
 text=\"#c8c8c8\" width=\"100%\">
            <tr><th colspan=\"7\">Please check off all Sports that interest you</th></tr>
$sportboxes
        </table>
          </td>
        </tr>
        <tr>
          <td align=\"center\"><input type=\"submit\" value=\"Update Interests\"></td>
          <td align=\"center\"><input type=\"reset\" value=\"Nah, Nothing's Changed\"></td>
        </tr>
    </table>
      </form>
    </center>
  </body>
</html>
END;
} 
?>POSIX. because a stable os that doesn't have memory leaks and isn't buggy is always good.