Imagecreatefromjpeg()

Hi, I've seen this bounced around on the archives a bit, but none of the advice on there is working for me. I'm trying to do something very simple: <? Header("Content-type: image/jpeg"); $im = ImageCreateFromJpeg('1234_1.jpg'); ImageJpeg($im);?> The file is in the folder, it has execute and write permissions set, and the error given is "The image cannot be displayed, because it contains errors.", which is not very useful. Anyone have any suggestions? Thanks, Sara Keesler