affichage d'image

je me permets de vous soumettre mon problème car après 2 jours je ne vois plus aucune solution, et les différents forums que j'ai visité ne m'ont pas éclairé.

voici mon code dans le 1 page
images.php:

Code :
echo "<img border=\"0\" src=\"gest_image_mois/image.php?File=$aData[Image]&w=75&h=75\" width=\"75\" height=\"75\">";

avec image.php contient:

Code :
<?php
function getFileExtension($str) {
$i = strrpos($str,".");
if (!$i) { return ""; }
$l = strlen($str) - $i;
$ext = substr($str,$i+1,$l);
$ext = strtolower($ext);
if($ext == "jpg"|| $ext == "jpeg" || $ext == "gif" || $ext == "png")
{


}
else
{
echo"<strong>$ext</strong> type is not accepted.Please upload only JPG, Gif and PNG Extenstions";
exit();
}
return $ext;
}





function CopyImageFileGD($name,$ext,$newwidth,$newheight) {

if($ext == "jpg"){

$new_img = imagecreatefromjpeg("./gest_image_mois/images_files/$name");

}elseif($ext == "png"){

$new_img = imagecreatefrompng("gest_image_mois/images_files/$name");

}elseif($ext == "gif"){

$new_img = imagecreatefromgif("gest_image_mois/images_files/$name");

}



list($width, $height) = getimagesize("gest_image_mois/images_files/$name");



$resized_img = imagecreatetruecolor($newwidth,$newheight);


imagecopyresized($resized_img, $new_img, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
ImageJpeg ($resized_img);
ImageDestroy ($resized_img);
ImageDestroy ($new_img);
}

$ext = getFileExtension($_GET['File']);



if(!empty($_GET['File']) && !empty($_GET['w']) && !empty($_GET['h']))
{



$q1 = "update `images` set `Viewed` = Viewed+1 where `Image` = '$_GET[File]'";
mysql_query($q1) or die(mysql_error());


header('Content-Type: image/jpg');
echo $Image = CopyImageFileGD($_GET['File'],$ext,$_GET['w'],$_GET['h']);
}

?>




mais ce script ne marche pas un error été affiché comme ca:

Code :

ÿØÿàJFIF



ÿþ>CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), default quality ÿÛC    $.' ",#(7),01444'9=82<.342ÿÛC
 2!





je ne rien comprie
merci d'avance