Making thumbs same size

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Hey hi!!.

I have a few pages that uploads images to the apache server and makes a
registry on a mysql database. Everything is going well just for a few
details.

When I make the upload for an image, it creates me a thumb image, but not as
I want. For example, if I have an image that its of 2000 x 2000 px, the
thumb created is 200 x 200, If I upload another with 300x300 px, my thumb
will be 30x30 px, making look the gallery pretty bad.  The only thing that I
need is that all my thumbs were on the same size.
I've tried to modify the thumb width and height size, but doesnt work..
Probably I am not undersatnding hoy to use the resampling() tool.

here is my code.

<?php
include("connection.php");
//make variables avaliable
$image_caption = $_POST['image_caption'];
$image_username = $_POST['image_username'];
$image_tempname = $_FILES['image_filename']['name'];
$image_date = date($_POST['image_date']);
$today= date("Y-m-d");
//upload image and check for image type
$ImageDir="/var/www/apache2-default/images/";
$Imagethumb=$ImageDir."thumbs/";
$ImageName=$ImageDir . $image_tempname;
if (move_uploaded_file($_FILES['image_filename']['tmp_name'],
                            $ImageName)) {
//get info about the image being uploaded


list($width, $height, $type, $attr)= getimagesize($ImageName);

//insert info into the table
$insert= "insert into rsiis_images
           (image_caption,image_username,image_date,image_date_upload)
           values
           ('$image_caption','$image_username','$image_date','$today')";
           $insertresults=mysql_query($insert)
           or die(mysql_error());
           $lastpicid=mysql_insert_id();


           $newfilename=$ImageDir . $lastpicid .".jpg";
           if($type==2){
                       rename($ImageName, $newfilename);
           } else {
            if ($type==1){
               $image_old=imagecreatefromgif($ImageName);
           }elseif ($type==3){
               $image_old=imagecreatefrompng($ImageName);
           }

           //"convert the image to JPG

           $image_jpg=imagecreatetruecolor($width,$height);
           imagecopyresampled($image_jpg,$image_old, 0, 0, 0, 0, $width,
$height,$width,$height);

           imagejpeg($image_jpg,$newfilename);
           imagedestroy($image_old);
          imagedestroy($image_jpg);
           }

$newthumbname=$Imagethumb.$lastpicid.".jpg";
//get dimensions of the thumbnail

$thumb_width=$width*0.10;
$thumb_height=$height*.10;

//Create thumbnail
$largeimage=imagecreatefromjpeg($newfilename);

$thumb=imagecreatetruecolor($thumb_width,$thumb_height);
imagecopy($thumb, $largeimage, 0, 0, 0, 0,$width,$height);
           imagecopyresampled($thumb, $largeimage, 0, 0, 0, 0,

$thumb_width,$thumb_height,$width,$height);
                                    imagejpeg($thumb,$newthumbname);
imagedestroy($largeimage);
imagedestroy($thumb);


$url="location:showimage.php?id=".$lastpicid;
header($url);


}


?>



thanks for your help

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