Is there a way to create a global list, in Adobe, so many combo boxes can access it?

I have created a document javascript:

var instructors = new Array(" ","10 Ferrell","18 Mills","19 Banner","35 L. Robinson","47 G. Robinson","48 Williams","62 Mask","65 Buchanan","88 Brackett"); // define array of items for combo boxes

var oComboBox = this.getField(event.value); // get combo box
oComboBox.setItems(instructors); // set items from array

but somehow the information doesn't get entered into the combo boxes.  I'm trying to use the event.value code so I don't have to include all the field values.  I have referenced the javascript in the Format > Custom Keystroke Script.  There are 400 combo boxes referring to this one array.  It would be really nice to only have to change this array 1 time when an instructor leaves instead of 400 times.  Plus the form takes a long time to open up with all the fields.  What am I doing wrong??