var nf = numberFormatter("###,###");
alert( nf(123) );
alert( nf(1234));
alert( nf(12345));
alert( nf(123456));
alert( nf(1234567));
alert( nf(12345678));
alert( nf(123456789));
alert( nf(1234567890));
alert( nf(12345678901));
alert( nf(123456789012));