document.observe(
	'dom:loaded',
	function()
	{
		$('ContactOrganizationId').observe('change', updateOrg);
		$('ContactOrganizationId').observe('keyup', updateOrg);
		updateOrg();
	}
);

function updateOrg()
{
	var dropdown = $('ContactOrganizationId');
	if (dropdown.options[dropdown.selectedIndex].value == '')
	{
		$('ContactOrganizationWritein').up().setStyle({display:'block'});
	}
	else
	{
		$('ContactOrganizationWritein').up().setStyle({display:'none'});
	}
}