Image on Image (another watermark question)

[goaman]

Hi!
I'm trying to add a copyright image(watermark) on another image while uploading .. It doesn't work at all, can anyone pls tell me whatz wrong with this?

Thanks!

Uploading Code:

//watermark code

function watermark($srcfilename, $newname) { 
$watermark="images/watermark.png";
$quality="100";
$imageInfo = getimagesize($srcfilename); 
$width = $imageInfo[0]; 
$height = $imageInfo[1]; 
$logoinfo = getimagesize($watermark); 
$logowidth = $logoinfo[0]; 
$logoheight = $logoinfo[1]; 
$horizextra =$width - $logowidth; 
$vertextra =$height - $logoheight; 
$horizmargin = round($horizextra / 2); 
$vertmargin = round($vertextra / 2); 
$photoImage = ImageCreateFromJPEG($srcfilename); 
ImageAlphaBlending($photoImage, true); 
$logoImage = ImageCreateFromPNG($watermark); 
$logoW = ImageSX($logoImage); 
$logoH = ImageSY($logoImage); 
ImageCopy($photoImage, $logoImage, ImageSX($photoImage)-$logoW, ImageSY($photoImage)-$logoH, 0, 0, $logoW, $logoH); 
//ImageJPEG($photoImage); // output to browser
ImageJPEG($photoImage,"wallpapers/".$newname, $quality); 
ImageDestroy($photoImage); 
ImageDestroy($logoImage); 
} 


//filename
$filename =  $_FILES['filetoupload']['name'];


if (watermark($_FILES['filetoupload']['tmp_name'], $filename)) {

//file has been uploaded
echo "File <b>$filename </b> uploaded!";
exit();

}