imagecreatefromjpeg

i have a problem with my resizing image script. It all works fine on my localhost server, but once i upload the whole thing on my webhost, the script allows resizing of images not bigger than 600kb or something aournd that size. so my question. does that problem depend on settings from my webhost. i uploaded (without resizing) images with a filesize of 1.2mb and it was working. but once i try to add the resizing function i get following error message Fatal error: Allowed memory size of 8388608 bytes exhausted at (null):0 (tried to allocate 1632 bytes) in /var/www/html/familie/cms/addimage.php on line 39 can you help me out with this... thanx J