Размеры избражений

<?php
// File and new size
$filename = 'test.jpg';
$percent = 0.5;

// Content type
header('Content-type: image/jpeg');

// Get new sizes
list($width, $height) = getimagesize($filename);
$newwidth = $width * $percent;
$newheight = $height * $percent;

// Load
$thumb = imagecreatetruecolor($newwidth, $newheight);
$source = imagecreatefromjpeg($filename);

// Resize
imagecopyresized($thumb, $source, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);

// Output
imagejpeg($thumb);
?>

imagejpeg($thumb);

header("Content-Type: image/jpeg");

Warning: Cannot modify header information - headers already sent by (output started at z:\home\moon\www\xxx.php:2) in z:\home\moon\www\xxx.php on line 11

imagejpeg($thumb);

function ImageReSize($outfile,$infile,$neww,$newh,$quality)
{
$size = getimagesize($infile);
$format = strtolower(substr($size['mime'], strpos($size['mime'], '/')+1));
if ($format == 'jpeg')
{
$im = imagecreatefromjpeg($infile);
$header = 'Content-Type: image/jpeg';
}
elseif ($format == 'png')
{
$im = imagecreatefrompng($infile);
$header = 'Content-Type: image/png';
}
elseif ($format == 'gif')
{
$im = imagecreatefromgif($infile);
$header = 'Content-Type: image/gif';
}
header($header);
$im1=imagecreatetruecolor($neww,$newh);
imagecopyresampled($im1,$im,0,0,0,0,$neww,$newh,$size[0],$size[1]);
if ($format == 'jpeg')
imagejpeg($im1,$outfile,$quality);
elseif ($format == 'png')
imagepng($im1,$outfile,$quality);
elseif ($format == 'gif')
imagegif($im1,$outfile,$quality);
imagedestroy($im);
imagedestroy($im1);
flush();
}