Select An Element In A Form Using Xhtml Strict

I am coding xhtml strict for my pages for the first time and I got some one problem with javascript:

I don't know how to modify the scripts to target elements on the page where the name attribute is deprecated.

Eg.

Code:

<form action="test.php" method="post">
<div><input name="text" />
<input type="submit" name="submit" value="search" /></div>
</form>
how can I modify the code to select such fild in such form ?

The following one is not working:

document.form.text.focus();