Problem with form input type in XHTML 1.1

In my sidebar there is this code:

<h2>Search</h2>
<div id=”searchdiv”>
<form id=”searchform” method=”get” action=””>
<input type=”text” name=”s” size=”15″ /></form>
</div>

The template uses XHTML 1.1 and the problem is that this code doesn´t validate. I get 2 messages:

1. document type does not allow element “input” here; missing one of “ins”, “del”, “h1”, “h2”, “h3”, “h4”, “h5”, “h6”, “p”, “div”, “address”, “fieldset” start-tag.

2. end tag for “form” which is not finished

Both concerning this line:

<input type=”text” name=”s” size=”15″ /></form>

How can I fix this to make it validate.
Could not find an answer by searching.

Bernhard