$( function() {

	var $membershipTypes = $( "input", $("#membership-types") );
	var $membershipTypePro = $("#membership-type-professional");
	var $prosInSameOffice = $("#pros-in-same-office");
	
	$membershipTypes.click( _membershipTypeChanged );
	
	_membershipTypeChanged();
	
	function _membershipTypeChanged() {
	
		if ( $membershipTypePro.attr("checked" ) ) {
			$prosInSameOffice.removeAttr("disabled");
		} else {
			$prosInSameOffice.attr("disabled","disabled");
		}
	
	}
	
} );