imagecreatefromjpeg help.

Im trying to use imagecreatefromjpeg to retrieve an image off another website and make an thumbnail out of it, is this possible? heres the code that I'm using that works as long as the image is on the same server. <?php // we expect $hSize and $image to be defined, having been passed to us via // query string. $vSize will generated to maintain aspect ratio. $image = realpath ("") . $image; // create an image object from the source file $srcImg = imagecreatefromjpeg($image); // create a (blank) smaller image object $srcSize = getimagesize($image); $vRatio = $hSize / $srcSize[0]; // percentage $vSize = $srcSize[1]* $vRatio; $dstImg = imagecreate($hSize, $vSize); // copy and resize from the source image object to the smaller blank one imagecopyresized($dstImg, $srcImg, 0, 0, 0, 0,$hSize, $vSize,$srcSize[0], $srcSize[1]); // send the smaller image object to the browser header( "Content-Type: image/jpeg"); imagejpeg($dstImg); // clean up imagedestroy($scrImg); imagedestroy($dstImg); ?>