terrace skin on form

How can I applay terrace skin on my simple form. My code:

[code]

Form test
<link rel="stylesheet" type="text/css" href="codebase/skins/dhtmlxform_dhx_terrace.css">
<script src="codebase/dhtmlxcommon.js"></script>
<script src="codebase/dhtmlxform.js"></script>
[/code] All I get is button labels? Thanks in advance
myForm.setSkin('dhx_terrace');

thx