Removing the fieldwitherrors div using RJS

I have a form in which one field can be validated using RJS.

If the user hits 'submit'(which is via POST) and that field is invalid it will return something like : <div class='fieldwithErrors'><input name="cc[coupon]" size="30" type="text" id="cc_coupon" value="xxxxxx" /></div>

Using AJAX the entered data could at one point become valid and then I need to remove the 'fieldwitherrors' div(which places a red background around the input field) with something else using RJS.

Any ideas how I could do this?