I'm using GD2. But now appearently after I've tried to upload smaller picture with EXIF info, it was OK. Check this out http://www.chip.co.id/gallery/showphoto.php?photo=13
I'm not sure what was the problem. Later I will try to turn of JHEAD extraction & see what will happen. Will try to upload bigger picture as well. Thanks omegatron!
BTW, to show this EXIF info is my last step before we open the photopost gallery to public. I can't wait to do that