Javascript voting

[Yours Truly]

My code:

PHP Code:

<script language="JavaScript">
function radio_input(url)
{
// Re-direct the browser to the url value
window.location.href = "showthread.php?$session[sessionurl]t=$thread[threadid]";
}
</script>
<!-- thread rating menu -->
<form action="threadrate.php?t=$threadid" method="post" id="showthread_threadrate_form">
    <table style="background:#FFDC84;color:#000;" id="threadrating" cellpadding="4" cellspacing="1" width="100%" border="0" class="tborder" align="center">
        <tr>
            <td style="background:#FFDC84;color:#000;" id="threadrating">
                <div align="center" id="threadrating_current">
                    <div align="left"><strong>Please rate <i>$threadinfo[title]</i></strong></div><br /><br />
                    <a name="goto_threadrating"></a>
                    <td ><strong>1
                          <input name="vote" type="radio" id="vote1" value="1" onClick="JavaScript:radio_input('$votechecked[1]')"$votechecked[1]/>
                    </strong></td>
                    <td ><strong>2
                          <input name="vote" type="radio" id="vote2" value="2" onClick="JavaScript:radio_input('$votechecked[2]')"$votechecked[2]/>
                    </strong></td>
                    <td ><strong>3
                          <input name="vote" type="radio" id="vote3" value="3" onClick="JavaScript:radio_input('$votechecked[3]')"$votechecked[3]/>
                    </strong></td>
                    <td ><strong>4
                          <input name="vote" type="radio" id="vote4" value="4" onClick="JavaScript:radio_input('$votechecked[4]')"$votechecked[4]/>
                    </strong></td>
                    <td ><strong>5
                          <input name="vote" type="radio" id="vote5" value="5" onClick="JavaScript:radio_input('$votechecked[5]')"$votechecked[5]/>
                    </strong></td>
                                  </div>
                             </div>
            </td>
        </tr>
    </table>
  </form> 


It redirects and all but it doesn't seem to register the vote.

Any ideas?