How to prevent browser from remembering text field content?

Possible Duplicate:
Is there a W3C valid way to disable autocomplete in a HTML form?

Is there a way I can prevent a browser from not remembering the content of a text field? The problem is that the field contains a value such as 100, and then gets appended a currency symbol such as € making it 100 €. If I click on the field, my widget removes the currency and I can edit the bare number, and when I blur it displays the currency again. Everything works fine until you hit F5 and then you end up having 100 € € because the browser restored the original value 100 € it had when the reload happened, and the widget re-added it.