Image thumbnail der ikke virker 100%

Hej derude

Jeg har en side hvor jeg skal resize nogle billeder. Her bruger jeg dette script:

   
//make sure this directory is writable!
$path_thumbs = "files/thumb";       
//the new width of the resized image, in pixels.
$img_thumb_width = 200; //
$extlimit = "no"; //Limit allowed extensions? (no for all extensions allowed)
//List of allowed extensions if extlimit = yes
$limitedext = array(".gif",".jpg",".png",".jpeg",".bmp");       
//the image -> variables
$image = time().substr($_FILES['vImage']['name'],strrpos($_FILES['vImage']['name'],'.'));
$file_type = $_FILES['vImage']['type'];
$file_name = $_FILES['vImage']['name'];
$file_size = $_FILES['vImage']['size'];
$file_tmp = $_FILES['vImage']['tmp_name'];
//check if you have selected a file.
if(!is_uploaded_file($file_tmp)){
echo "Error: Please select a file to upload!. <br>--<a href=\"$_SERVER[PHP_SELF]\">back</a>";
exit(); //exit the script and don't process the rest of it!
}
//check the file's extension
$ext = strrchr($file_name,'.');
$ext = strtolower($ext);

//so, whats the file's extension?
$getExt = explode ('.', $file_name);
$file_ext = $getExt[count($getExt)-1];
//create a random file name
$rand_name = md5(time());
$rand_name= rand(0,999999999);
//the new width variable
$ThumbWidth = $img_thumb_width;
$ThumbWidth = 100; //
/////////////////////////////////
// CREATE THE THUMBNAIL //
////////////////////////////////

//keep image type
if($file_size){
if($file_type == "image/pjpeg" || $file_type == "image/jpeg"){
$new_img = imagecreatefromjpeg($file_tmp);
}elseif($file_type == "image/x-png" || $file_type == "image/png"){
$new_img = imagecreatefrompng($file_tmp);
}elseif($file_type == "image/gif"){
$new_img = imagecreatefromgif($file_tmp);
}
//list the width and height and keep the height ratio.
list($width, $height) = getimagesize($file_tmp);
//calculate the image ratio
$imgratio=$width/$height;
if ($imgratio>1){
$newwidth = $ThumbWidth;
$newheight = $ThumbWidth/$imgratio;
}else{
$newheight = $ThumbWidth;
$newwidth = $ThumbWidth*$imgratio;
}
//function for resize image.
if (function_exists(imagecreatetruecolor)){
$resized_img = imagecreatetruecolor($newwidth,$newheight);
}else{
die("Error: Please make sure you have GD library ver 2+");
}
//the resizing is going on here!
imagecopyresized($resized_img, $new_img, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
//finally, save the image
ImageJpeg ($resized_img,"files/thumb/$image");
ImageDestroy ($resized_img);
ImageDestroy ($new_img);


}

move_uploaded_file ($file_tmp, "files/thumb/$image");

Dette er noget jeg har fundet fra diverse sider som jeg har prøvet mig frem med og det virker også nogenlunde...
Men når jeg uploader billeder over 1mb går det helt galt og der bliver ikke vist noget på siden overhovedet.

Nogen løsningsforslag ?
på forhånd tak