Thanks so much, it worked....it now displays as a 300x100 text field, but it still functions as a single-lined text field. I'm sure theres an easy to fix this code to make it function like a multi-lined text box (like this:
http://www.echoecho.com/htmlforms08.htm)
<input id="po{$v.classid}" type="text" name="{$poname}" value="{$v.default|escape}" style="width:300px;height:100px" />