note 59790 added to function.imagecreatefromjpeg

hello, i have ine problem about this. I have script, which makes thumbnails from images, and i use there that function, but i get message like this: Fatal error: Call to undefined function imagecreatefromjpeg() so i dont know what to do, can you help me please? ---- Manual Page -- http://www.php.net/manual/en/function.imagecreatefromjpeg.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+59790 Delete: added to the manual -- http://master.php.net/manage/user-notes.php?action=delete+59790&report=yes&reason=added+to+the+manual Delete: bad code -- http://master.php.net/manage/user-notes.php?action=delete+59790&report=yes&reason=bad+code Delete: spam -- http://master.php.net/manage/user-notes.php?action=delete+59790&report=yes&reason=spam Delete: useless -- http://master.php.net/manage/user-notes.php?action=delete+59790&report=yes&reason=useless Delete: non-english -- http://master.php.net/manage/user-notes.php?action=delete+59790&report=yes&reason=non-english Delete: already in docs -- http://master.php.net/manage/user-notes.php?action=delete+59790&report=yes&reason=already+in+docs Delete: other reasons -- http://master.php.net/manage/user-notes.php?action=delete+59790&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+59790&report=yes Search -- http://master.php.net/manage/user-notes.php