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I have a button to calculate trip information. I can't get the message box to pop up in the following code. Can anyone tell me why? If [odometer end] and [odometer start] are null and I click the calculate button nothing happens, I want the message box to appear. here is the code I am using...

I have created a user input form with three input fields [a], [b] and [c]. I want the user to populate any two of the three fields then have the third field be caculated based on the user's input [c]=[a]-[b], [a]=[b]-[c] and [b]=[a]-[c]. I would love to not have the form validate until two of...