Details section not showing

i added some fields in

Activity type field:

fields: field customer visit, Customer Visit, Engaged With,Joint call,Joint Visit,Opportunity,Registration.etc

i have some fields in '

Case type field:

fields: Customer complaints,DC Receiving, Dc Shipping,Dispute etc

when i select Field customer visit in Activity type .  

the "details section" -see pic 1 at the bottom of CRM Page is showing

when i select different activity type other than field customer visit Details section are not showing

what will be the issue. to show details section i added this code

else if (selectedCaseType.getValue() == 100000004) { // Field Customer Visit
activityTypeOptionSet.clearOptions();
for (var i = 0; i < options.length; i++) {
var v = options[i].value;

if (v == 100000052 || v == 100000070 || v == 100000071 || v == 100000072 || v == 100000073 || v == 100000074 || v == 100000075 || v == 100000076) {
activityTypeOptionSet.addOption(options[i]);


Xrm.Page.getAttribute("new_acttype").fireOnChange();

}
}
}