Lost scrollbar in textarea for Firefox

[code]
* html .finput { height: 19px; } /* big enough for styled text */
.finput { /* input boxes on forms */
height: 15px;
border-top: 2px solid #0000B0;
border-left: 2px solid #0000B0;
border-right: 1px solid #8F8F8F;
border-bottom: 1px solid #8F8F8F;
padding: 0 2px 0 2px;
background-color: #FFFFFF;
font-family: Helvetica, Arial, sans-serif;
font-size: 14px;
font-weight: normal;
color: #000000;
}
// and
Message<br>
<textarea name=’Msg’ class=’finput’ style=’width:420px; height:30px’></textarea>
[/code]

The css is used for text inputs as well as for textarea input. The former (for which I specify width only, of course) is perfect, the latter is also except that there is no scroll bar in Firefox. FF normal behavior is that none is present until needed, but with this usage none becomes available when needed either. In all other respects, and for IE, the textarea behaves properly.

Ideas how to restore the scrollbar?

You can see it in action on [URL=http://www.sonora-sw.com/railroad/email.php]this[/URL] page.
Edit again: I increased the height to 50px (strictly a style issue, actually) and the scrollbar returned.

Also in #CSS _↴