window.addEvent('domready', function() {

    $$('.Parent1PrimaryButton').addEvent('click', function() {
        $$('.primary1span').setHTML('(Primary contact)');
        $$('.primary2span').empty();
    });
    
    $$('.Parent2PrimaryButton').addEvent('click', function() {
        $$('.primary2span').setHTML('(Primary contact)');
        $$('.primary1span').empty();
    });

    $$('.RegisteringDropDown').addEvent('change', function() {
        
        var myForm = document.forms["aspnetForm"];
        var mySlct = myForm[myFormClientId];
        var myValu = mySlct.options[mySlct.selectedIndex].value;
        
        if (myValu == "1") {
            $$('.oneChild').setStyle('display', 'block');
            $$('.twoChildren').setStyle('display', 'none');
            $$('.threeChildren').setStyle('display', 'none');
            $$('.fourChildren').setStyle('display', 'none');
            $$('.submit').setStyle('display', 'block');
        }
        
        if (myValu == "2") {
            $$('.oneChild').setStyle('display', 'block');
            $$('.twoChildren').setStyle('display', 'block');
            $$('.threeChildren').setStyle('display', 'none');
            $$('.fourChildren').setStyle('display', 'none');
            $$('.submit').setStyle('display', 'block');
        }
        
        if (myValu == "3") {
            $$('.oneChild').setStyle('display', 'block');
            $$('.twoChildren').setStyle('display', 'block');
            $$('.threeChildren').setStyle('display', 'block');
            $$('.fourChildren').setStyle('display', 'none');
            $$('.submit').setStyle('display', 'block');
        }
        
        if (myValu == "4") {
            $$('.oneChild').setStyle('display', 'block');
            $$('.twoChildren').setStyle('display', 'block');
            $$('.threeChildren').setStyle('display', 'block');
            $$('.fourChildren').setStyle('display', 'block');
            $$('.submit').setStyle('display', 'block');
        }
    });
    
});