Thread: Hook define( 'VA_MAX_IMAGES', 10 ); into a function?

Hook define( 'VA_MAX_IMAGES', 10 ); into a function?

Hi,
Is it also possible to hook a custom
define( 'VA_MAX_IMAGES', 20 );

into a function?
If so, where to hook it? I am trying some if else statements to determine the max images amount and i need to put that statement into a function (functions.php)

Thanks.