I have a total of two input values. Only one value passes to the url of the next page, but both should. What's causing this?

JSFiddle: <http://jsfiddle.net/p8dCC/>

HTML:

```
  <!--form action="device" onSubmit=" get_search(); return false;" id="search-form-4" method="get" target="_top"-->
  <div class="fix">Brand</div>
  <input class="inputs" type="text" id="search_id" name="q3" placeholder="Send this" required="required" /> 
   <br/><br/>

  <div class="fix">Model</div>
  <input class="inputs" type="text" id="search_id" name="q4" placeholder="And send this one too" required="required" /> 
   <br/><br/>

<input id="search-button" class="" type="submit" value="continue" data-target="http://www.google.com/?item-description" />
<!--/form-->

```