Drawing a red rectangle

[Cogen]

Hello, I am having enormous trouble trying to draw a red rectangle on a jpeg. I can draw the rectangle on the image using imagefilledrectangle(), but when I try to specify red, it comes out pink. I also tried to get white as a test and can't do that either.
Please help

Here is what I have been trying.

//imagetest.php
function LoadJpeg($imgname) 
{
   $im = @imagecreatefromjpeg($imgname);
   if ($im) { 
	$bgc = imagecolorallocate($im, 255,0,0);
	imagefilledrectangle($im, 0, 225, 275, 240, $bgc);
	return $im;
   }
}

header("Content-type: image/jpg");
imagejpeg(LoadJpeg("images/rect_test.jpg"));
 

I call that from a different file using
<IMG SRC="imagetest.php" border="0">