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   1  function watermark($imagesource){
   2  	$filetype = substr($imagesource,strlen($imagesource)-4,4); 
   3  	$filetype = strtolower($filetype); 
   4  	if($filetype == ".gif")  $image = @imagecreatefromgif($imagesource);  
   5  	if($filetype == ".jpg")  $image = @imagecreatefromjpeg($imagesource);  
   6  	if($filetype == ".png")  $image = @imagecreatefrompng($imagesource);  
   7  	if (!$image) die(); 
   8  	$watermark = @imagecreatefrompng('../images/watermark.png'); 
   9  	$imagewidth = imageSX($image); 
  10  	$imageheight = imageSY($image);  
  11  	$watermarkwidth =  imageSX($watermark); 
  12  	$watermarkheight =  imageSY($watermark); 
  13  	$startwidth = $imagewidth - $watermarkwidth - 5;  
  14  	$startheight = $imageheight - $watermarkheight - 5;
  15  	imagecopy($image, $watermark,  $startwidth, $startheight, 0, 0, $watermarkwidth, $watermarkheight); 
  16  	imagejpeg($image,$imagesource);
  17  	imagedestroy($image); 
  18  	imagedestroy($watermark);
  19  }