trying to curl get image, but i get weird results

this is my curl function:

function curl($url) {
$ch = curl_init();
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_VERBOSE, 0);
curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;     SV1; .NET CLR 1.0.3705; .NET CLR 1.1.4322)');
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, TRUE);
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt ($ch, CURLOPT_COOKIEJAR, 'picturecookies.txt');
curl_setopt($ch, CURLOPT_REFERER, "http://www.google.com/");
curl_setopt($ch, CURLOPT_URL, $url);
$return = curl_exec($ch);
return $return;
}

an example image im trying to get:

http://static.fjcdn.com/large/pictures/39/29/3929d8_2637027.jpg

when i try getting the image with curl, i only get a开发者_C百科 file with random filesizes each time. heres a list of bytes returned 6 times in a row;

12 654
12 627
12 632
12 632
12 583
12 627

the example image is 655kB

what am i doing wrong here?

EDIT:

I found why :> The images are hotlink protected. It was simply solved by changing the referer to the url the image was presented on.

You are probably getting redirecteed to the funnyjunk index page without noticing ;-)