[REQUEST] Update Notifier

I would like to request this script:

It should - every time it starts - , read an page on the net (like http://rmrk.net/MyGame/UpdateNotifier/BETA_0.2.htm).
If the page shows something like: Newest version, it should start normal.
But if it shows something like: Newer Version, it should block the game from starting, and show a message like: BETA 0.3 Released, please update if you want to keep playing.

Spoiler for:

In my own (fantasy xD) coding language it would look like this:
<$meScript
download ['http://rmrk.net/MyGame/UN/BETA_0.3.msf'] store in = ['variable']
read ['variable']
if ['variable'] shows ['Latest_Version']
           show: ['You got the latest version!']
           open: ['Title_Screen']
if ['variable'] shows ['Newer_Version_%S'] %S = ['variable_version']
           show: ['Version ['variable_version'] has been released, please update to keep playing']
           quit ['Game']
else
           show: ['An error occured while reading version number, please try again later, or contact game support.']
           quit ['Game']
$meScript>

The .msf file could be anything here, because i just wanted to give an example.

Many, many, many thanks in advance,
Megaempire11