well, after reviewing a few other postings, I created the following:
$(document).ready(function () {
$('.thirdPartyForm').hide();
if ($.cookie('showhide') == 'showtp') {
$('.thirdPartyForm').show();
}
$('#thirdPartyService').click(function () {
if ($(this).is(':checked')) {
$(".thirdPartyForm").show();
$.cookie('showhide', 'showtp');
}
else {
$(".thirdPartyForm").hide();
$.cookie('showhide', null);
};
});
});