Controlling Text Field Width With JS

I’m using the following Java Script to set the width of text fields:

<SCRIPT>
if (navigator.appName == 'Netscape') {
document.write('<INPUT type="text" name="textfield" maxlenght="30" class="forms" size=14>
');
} else {
document.write('<INPUT type="text" name="textfield" maxlenght="30" class="forms" size=30>
');
}
</SCRIPT>

How do I use that script to set the width of the text area field below?

<textarea name="textfield2" cols="50" rows="6" class="forms"> </textarea>