Server Settings or bad code?

[craftymind]

if($picture_change == "yes" && $main_picture != ""){
	if ($main_picture_type == "image/pjpeg"){
		$dest_file = "../../images_dynamic/".$section."_".$id.".jpg";
		$imagehw = getimagesize($main_picture);
		$src_w = $imagehw[0];
		$src_h = $imagehw[1];
		$dest_w = 165;
		if($dest_w != $src_w){
			$float = ($dest_w*$src_h)/$src_w;
			$dest_h = round($float);
		}else{
			$dest_h = $src_h;
		}		
		$quality = 90;
		$src_img = imagecreatefromjpeg($main_picture);
		$dest_img = imagecreatetruecolor($dest_w, $dest_h);
		imagecopyresampled($dest_img, $src_img, 0, 0, 0, 0, $dest_w, $dest_h, $src_w, $src_h);
		if(imagejpeg($dest_img, $dest_file, $quality)){
			echo "image created<br>";
		}
		imagedestroy($src_img); 
		imagedestroy($dest_img);
	}else{
		echo "File is not an image";
	}
}

When I run this code on one server under our host everything goes through without a hitch.
On the second server i get an error:

Fatal error: Call to undefined function: imagecreatefromjpeg() in /hsphere/local/home/sjohnson/testdomain/admin/content/product_mod.php on line 34

(edit) Can anyone please tell me if my code is wrong or do I need to contact our server admin to fix this?

[Wave]

this is server configuration problem.
you just need to ask your server administrator to install GD library. (image processing module)

[craftymind]

thank you, it's now being sorted out as we speak.