jquery replaceWith problem

hi there,

(i am using jquery-1.3.2.min.jas
i am also using microsoft mvc )

I have one input text box - when i add a integer value to it - that value is ran against a simple calculation then inserted into a label.

This works fine the first time - but when i update the textbox value - the new calculated value is not inserted into the label - the old calculation remains.

However i have established (via an alert) that the change textbox event is firing - and the updated value is being re-calculated - but the insert is not happening.

here is my code:

 $("input:text").blur(function() {

//do my calculation - then the alert fires with the updated value
alert('my new calculation' + myCalculatedValue);

$("#myDisplayLabel).replaceWith(myCalculatedValue);
//but the value on the screen does not change from the first time the code is run
});

can anyone help?