Is there a way to tell maya which expression gets executed first?

My Stormy Ocean project is full of expressions and one of them contains some global variable initializations. Now every time I load the scene I get a bunch of errors because some of the expressions, which uses those global variables, gets executed before the variables are defined.

I've worked my way out of this by going through the expressions and hitting the edit button in the expression editor (the global thingie first). It's not a biggie but kind of annoying.

I hope you understood...