[jQuery] Prevent key to change values

[jQuery] Prevent key to change values


Hi every:
I have this function:
$("input[type='text']:order").keyup(function() {
var v = $(this).val().replace(/\D/g,''); // removes non numbers
$('#total_buyed').val( v * 2.75 );
});
The function is working correctly but when I press any key the same
operation is calculated. How to avoid this? See online at
http://jose-couto.com/pintpal4/order_pintpal2.html
Cheers and thanks in advance
--
ReynierPM