I found a couple of simple php scripts online, to upload a file through a webpage
but for some reason none of them work when i try to upload a file which is more 5 megs or so.

Is there a limit to the number of megs a php script can upload?

Php limit set in php.ini, could be the daemon limit too.

What folder is that in?

Are you running your own web server?

Nope.

Then you cant just go and change the value. Try creating a file with just < ?php phpinfo(); ?> and check the max upload size allowed.

There are 2 limits, post_max_size and upload_max_filesize.