function doCourseDateSubmit( id )
{
	var invalid,
		form = dojo.byId( id ),
		inputs = dojo.query( 'input[type="radio"][name="date"]', form );
	
	invalid = dojo.every
	(
		inputs,
		function( element )
		{
			return element.value == null;
		} 
	);
	
	if( invalid )
	{
		alert( 'Please select a course date' );
		return false;
	}
	
	form.submit();
}