The HTML markup for a wijtextbox widget can use an input or a textarea element, like this.

<h3>Input</h3>
<input id="textbox" type="text" />
<h3>TextArea</h3>
<textarea id="area" rows="5" cols="80"></textarea>

You can initialize the widget with the following jQuery script.

<script id="script1" type="text/javascript">
    $(document).ready(function () {
        $(":input[type='text'],:input[type='password'],textarea").wijtextbox();
    });
</script>

The markup and script featured here results in the following live widget.