upload_max_filesize

Hi,

I'm working on a little something to upload and share files with a friend.
I've hit a road block.
I'd like the file limit to be 15 megs, in order to do this I need to change
upload_max_filesize in the php.ini file.

I am on shared hosting and so I will use ini_set(upload_max_filesize,"15M")
[see http://us3.php.net/ini_set]

It does not work.
I've done ini_set(upload_max_filesize,15728640) as well.

my code that shows it not working:

ini_set(upload_max_filesize,15728640);
$inicheck=ini_get(upload_max_filesize);
echo "$inicheck";


It always echos the default 2M.

This is a major roadblock and I'd really appreciate any help!
If I need to clarify, I will :)
Thanks!