check box count continued on PG 2

I am trying to continue a count on page 2 of a document.

PG 1 works fine and I get a total on the bottom of the page.

I need to have the box show the total from both pages

currently there are 24 checkbox on pg 1,  C 1 - C 24

                                                              pg 2, C 25 - C 48

var total = 0;

for (var i=1; i<=24; i++) {

    if (this.getField("C "+i).value!="Off") { total++;

    }

}

event.value = total