Create a nag alert (update available!) checker script
<p>I have a remote updater script that resides in my wordpress theme folder. The script simply calls out to the central server and grabs a zip file which contains the latest updated files for the theme.</p>

<p>I'd like to enable a nag alert checker that executes whenever the theme's options panel is accessed and I'm just brainstorming it here for a sanity check.</p>

<p>The nag checker would simply look out on my central server and read the contents of a text file which contains the current version number (a 4 digit integer, 0001, 0002, etc and that's it).</p>

<p>If the 4 digit number contained in the text file is greater than the version number stored in the theme's version variable, then it would display a nag alert for the user so that they can execute the update script to retrieve the update.</p>

<p>Am I on the right track? Are there better ways to do this that are easier to implement? I suppose I could check a date stamp on the local update file and compare it to the update file on the server as well. Not sure which is best or easiest.</p>
