Steps:

1. Create Form
2. Identify Radio button you want to control the toggle of another field.
3. Identify the field you want to hide.
4. Modify below javascript code after line 46 and place into Form Properties-> Onload Event

function registerEvent(id,eventname,eventfunction)
{
	// Register the *eventfunction* to the target *id* object for any event named *eventname*
	var obj = document.getElementById(id);
	if (obj==null) return;

	if (obj.addEventListener) {
		obj.addEventListener (eventname,eventfunction,false);
	} else if (obj.attachEvent) {
		obj.attachEvent (eventname,eventfunction);
	}
}

function ToggleElement(id, yesid)
{
	// get object and toggle between none and block display
	var obj = document.getElementById(id);
	if (obj==null) return;

	var yesobj = document.getElementById(yesid);
	if (yesobj==null) return;

	if (yesobj.checked) {
		obj.style.display='block';
	} else {
		obj.style.display='none';
	}
}

function AddRadioButtonSectionToggle(radioid,sectionid,no)
{
	var x = '2';
	if (no==true) x='1';
	// Register the click events for the toggles.
	registerEvent(radioid+'1','onclick',function() { ToggleElement(sectionid,radioid+x);});
	registerEvent(radioid+'2','onclick',function() { ToggleElement(sectionid,radioid+x);});

	// Toggle it now!
	ToggleElement(sectionid,radioid+x);
}

function ToggleSectionFormLoad()
{
	// Enable Radio Button Section Toggle

	// false=for yes
	AddRadioButtonSectionToggle('rad_it_aproposaccount','it_apropospatternafterid_c',false);
	AddRadioButtonSectionToggle('rad_it_aproposaccount','it_apropospatternafterid_d',false);

	AddRadioButtonSectionToggle('rad_it_existingphone','{0d269004-9f91-de11-890f-0050569b7606}',false);
	AddRadioButtonSectionToggle('rad_it_existingphone','it_phonemacaddressoripaddress_c',true);
	AddRadioButtonSectionToggle('rad_it_existingphone','it_phonemacaddressoripaddress_d',true);

	AddRadioButtonSectionToggle('rad_it_activedirectorymstnet','it_mstaccountpatternafterid_c',false);
	AddRadioButtonSectionToggle('rad_it_activedirectorymstnet','it_mstaccountpatternafterid_d',false);

	AddRadioButtonSectionToggle('rad_it_activedirectorymscrmcrmlocal','it_patternemaildistributionlistmemid_c',false);//false if radio button default to no
	AddRadioButtonSectionToggle('rad_it_activedirectorymscrmcrmlocal','it_patternemaildistributionlistmemid_d',false);

	AddRadioButtonSectionToggle('rad_it_projectaccess','it_projectaccesstype_c',false);
	AddRadioButtonSectionToggle('rad_it_projectaccess','it_projectaccesstype_d',false);
	AddRadioButtonSectionToggle('rad_it_projectaccess','{d0306d89-6d92-de11-890f-0050569b7606}',false);
	AddRadioButtonSectionToggle('rad_it_project_issupervisor_timesheetmanger','it_timesheetmanagerid_c',true);//true if radio button default to yes
	AddRadioButtonSectionToggle('rad_it_project_issupervisor_timesheetmanger','it_timesheetmanagerid_d',true);

	}

ToggleSectionFormLoad();