Send config variable to index.php?

[eluser]spmckee[/eluser]
Greetings,

I am trying to implement a version switch and am running into issues.

In the index.php I am trying to change:

Code:

$application_folder .= "ver_1.0.1/app";

to

Code:

$application_folder .= "ver_".$app_version."/app";

I would like to pull the variable from a config file and I can do this almost everywhere else but the index.php is proving difficult. Any ideas?

Thanks,
SP