how to fill a bar in a graph

[NZ_Kiwis]

This is my code, i get a follow bar.. how can I fill these?

$data = array();
$x_fld = array(); 

$result = mysql_query ("SELECT COUNT(*), HitNumber, VisitTime FROM COUNTER GROUP BY FROM_UNIXTIME(VisitTime, '%Y-%m-%d')") or die("INSERT error: ".mysql_error());
WHILE ($row = mysql_fetch_array($result)){
$replies =  $row[0];
$time = $row['VisitTime'];
$time2 = strftime("%d/%m", $time);

$data[] = $row[0];
$x_fld[] = $time2; 
 }





    $max = 0;
    for ($i=0;$i<16;$i++){
      if ($data[$i] > $max)$max=$data[$i];  
    }

    $im = imagecreate(800,255); 

    $white = imagecolorallocate($im,255,255,255); 
    $black = imagecolorallocate($im,0,0,0);   
    $red = imagecolorallocate($im,255,0,0);   
    $blue = imagecolorallocate($im,0,0,255);  

    imageline($im, 10, 5, 10, 230, $blue );
    imageline($im, 10, 230, 790, 230, $blue);

    imagestring($im,3,15,5,"RLNZ 2",$black);
    imagestring($im,3,280,240,"Days",$black);
    imagestring($im,5,100,50,"Hits Graph",$red);

    $x = 15;   
    $y = 230;    
    $x_width = 25;  
    $y_ht = 0; 

    for ($i=0;$i<17;$i++){

      $y_ht = ($data[$i]/$max)* 100;  
      $y_ht2 = '215' - ($data[$i]/$max)* 100; 

      imagerectangle($im,$x,$y,$x+$x_width,($y-$y_ht),$red);
      imagestring( $im,2,$x-1,$y+1,$x_fld[$i],$black);

      imagestring( $im,2,$x-1,$y_ht2,$data[$i],$black); 

      $x += ($x_width+20);            
      }

    imagejpeg( $im);
    imagedestroy($im);

[Weedpacket]

[man]imagefilledrectangle[/man]?