You Don't Even Need a Submit Button....
Below is the HTML for the above:
<![CDATA[
<FORM METHOD=POST ENCTYPE="text/plain" ACTION=""
onSubmit="return confirm(city.value + ': That is a very nice city.')" >
What is your favorite city?
<INPUT TYPE=TEXT NAME=city SIZE=20
MAXLENGTH=40><P>
</FORM>
]]>