I am using the following to hide and show two forum elements. When their respective radio button are selected. However it's not working. I don't know why the elements are not dissapearing, sorry for my naiveness in the area. I am new at this. Any help is greatly appreciated.

The url to the page is: http://nctietheknot.com/rsvp.html

The javascript used is below:
Code:
window.onload = function(){
	document.getElementById('ind').checked = true;
	setInterval(check, 1000);
};

function check(){
	if(document.getElementById('fam').checked){
		openObject('family');
		closeObeject('individual')
	}else{
		openObject('individual');
		closeObeject('family');
	}
}

function closeObject(someID) 
{ 
document.getElementById(someID).style.display = 'none'; 
} 
function openObject(someID) 
{ 
document.getElementById(someID).style.display = 'block'; 
}