How do I transform my search form so that on enter it simply redirects users to what they wrote?

I want to transform the searc开发者_StackOverflow社区hform so that when an user clicks enter it simply redirects him to http://chusmix.com/text<what he searched for>

I want to do this so I can add some extra tags in the search form without the user knowing.

This is the code I use to display the search form:

<li id="search-10" class="widget_search">
<form role="search" method="get" id="searchform" action="http://chusmix.com/">
    <div>
    <input class="ubicacion" type="text" value="" name="s" id="s" style="margin-left:418px;">
    <input type="submit" id="searchsubmit" value="Buscar">
    </div>
    </form></li>
</ul>

Use JavaScript.

<form action="http://chusmix.com/" onsubmit="window.location = action + s.value; return false;">
    <input name="s">
    <input type="submit">
</form>