need help with bg color uploading transaprent image

[fifin04]

Hi...

okay I just have a simple upload and resize image for thumbnail code...and it works okay..my problem is.. if I'm uploading a transparent *.gif image it will create a black bg color for thumnail image..and for the original image as well..so is there any solution to this ..I mean I want the image and the thumbnail still remain transparent when the uploading process done...not fill in the bg with black color..like what I have just now ...so i really need help with it...

here's the code I'm using..

<? 
//error_reporting(E_ALL);
//Upload------------------------------------
if($_POST['Submit']){
	if ($_FILES['imagefile']['type'] == "image/gif"){
    	 copy ($_FILES['imagefile']['tmp_name'], "images/".$_FILES['imagefile']['name']) or die ("Could not copy");
    	 echo "";
	 }else {
          echo "<br><br>";
          echo "bad file type (".$_FILES['imagefile']['name'].")<br>";
		  exit;
	}
//-----upload end

//------start thumbnailer

 $thumbsize= 50;
 $imgfile = "images/$imagefile_name";//processed image
 header('Content-type: image/gif');
 list($width, $height) = getimagesize($imgfile);
 $imgratio=$width/$height;
 if ($imgratio>1){
       $newwidth = $thumbsize;
       $newheight = $thumbsize/$imgratio;}
 else{
      $newheight = $thumbsize;
      $newwidth = $thumbsize*$imgratio;
 }
      $thumb = ImageCreateTrueColor($newwidth,$newheight);
     $source = imagecreatefromgif ($imgfile);
     imagecopyresized($thumb, $source, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
     imagegif($thumb,"thumbs/$imagefile_name",100);
//-----------end--------------   

}
?>

thanks

[bradgrafelman]

Make the new thumbnail image transparent:

   $colourBlack = imagecolorallocate($imageOut, 0, 0, 0);
   imagecolortransparent($imageOut, $colourBlack);