Search box sends input to a iframe url on a new page

I want to have a search box where a person types in a number and the form opens a new page where there is an iframe and the url of the iframe is http://othersite.com/results.php?id=numbersinputfromsearchbox

Is this possible? I am using wo开发者_如何学Pythonrdpress with php/mysql/apache/linux if that helps you to answer me. Thanks!!

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<form action="http://othersite.com/results.php?id=numbersblahblah" method="post" target="_blank">
    <!-- form fields here -->
    <input type="submit" value="Search" />
</form>