Global Array?

I'm looking for a global array to store various integers in.

In IE and FF I always used this:
window[test] = 65;

This worked fine in FF and IE, but safari doesn't play ball.
I'm not sure if window[] is a special reserved array in those browsers, since I didn't even initialize it before using it, it just worked 'right out of the box'. Anyways, I tried going:

var window = new Array();

AND

var window = [];

but safari won't budge. Whenever I add values to the array, and try to do something with those values, safari says its not declared/undefined. What am I doing wrong?