Using switch statement in a dropdown

I am having a problem with using a Switch statement in the change event of a dropdown list. I want the user to select a choice from a dropdown which causes a subform containing just text to become visible. I have used the code below successfully:

var newValue = this.boundItem(xfa.event.newText);

switch (newValue)

{

    case "1":

        auw.presence="visible";

        cdrs.presence="hidden";

        eds.presence="hidden";

        excel.presence="hidden";

        fam.presence="hidden";

        hbcis.presence="hidden";

        emr.presence="hidden";

        mdp.presence="hidden";

        new.presence="hidden";

        oncall.presence="hidden";

        pfm.presence="hidden";

        ppr.presence="hidden";

        queue.presence="hidden";

        tele.presence="hidden";

        phone.presence="hidden";

        win.presence="hidden";

        brain.presence="hidden";

    break;

    case "2"

This seems to work when choosing from up to 7 choices in the dropdown but when I try to include all 17 choices it stops working. Can anyone tell me why this is, and is there anything missing? Thanks.