I think you'd just copy part of it again and change the field names. So you'd have two blocks like there are below, but change the field names and the variable names (e.g. websiteRow):
var websiteRow = $jQ("#Website").parents("li:first");
var websiteField = $jQ("#Website");
// when the triggering field changes...
$jQ("#Yesorno").change(function() {
var value = this.value;
// when "Yes", show the dynamic field and make it required
// when "No", hide the dynamic field
switch(value)
{
case "Yes":
websiteField.addClass("mktFReq");
websiteRow.addClass("mktFormReq").slideDown();
break;
default:
websiteRow.removeClass("mktFormReq").slideUp();
websiteField.removeClass("mktFReq");
}
}).change();