mine type problem.

HI, Please help me out, i would only let my client to upload gif or jpeg files only. So that I have set the following code. upload processing page. ( if I upload a gif file) echo $userfile_type; -->result image/gif (so that I have set the rules by not accepting any file types other than gif or jpeg.) if ($userfile_type!="image/gif" or $userfile_type!="image/jpeg") { echo 'not allowed';} But the problem starts here, when I try to upload a gif of jpeg files, it doesn't let me do so by printing "not allowed" as stated from the code above. So, it there any methods to limit the upload file type to only gif or jpeg. Thank you for your help Mark Lo