Underlined text in forms

Underlined text in forms

I have noticed that if the user do not write correct English in a form,
words get underlined in red. The problem comes when people writes correct
French or any other language that is not English, it gets underlined too.
How to control this? I mean, how to control the input language or at least
that never underline.
For instance in this form: http://jsfiddle.net/wxrJP/
if you write maison a red line appears.
HTML:
<form>
<input type="text" name="name">
<textarea id="normal" name="text"></textarea>
</form>