I have four exclusive Checkboxs across(vcheckbox) and One Checkbox
Down(hcheckbox1). They work fine but when you uncheck VAR T1 is should
return the value in c1 to Zero it doesn't. It remains with the last
value returned.
This script lives in textsub1. Is there something I can add in the
script for a null value in the checkbox for when it is unchecked?

var T1 = this.getField("hcheckbox1")
var T2 = this.getField("vcheckbox");
var c1 = this.getField("textsub1");
{
if
(T2.value == 20 & T1.value == 1)
(c1.value = 1);
else

if
(T2.value == 40 & T1.value == 1)
(c1.value = 2);
else

if
(T2.value == 60 & T1.value == 1)
(c1.value = 3);
else

if
(T2.value == 80 & T1.value == 1)
(c1.value = 4);
}