Does anyone know how to programmatically check a field for decimal places?

My users will be working in thousands and should only be able to work in thousands.

They can currently enter 1.5 into a text box, and I want to catch any potential errors...

Any help would be much appreciated

Can you change the field to Integer type? Or am I misunderstanding the question?

Also, is 1.5 an 'error' or is it shorthand for 1500?

David R