How do over a game to identify with this link click counter

and how do I update the page when the number does not disappear.?

<script type=text/javascript>
clickcounts var = '0 ';
function count () {
clickcounts + +;
document.getElementById ('clickcounts'). clickcounts = value;
}
</ script>

<a href="http://.google.com.br" target=_blank onclick="count()"> click </ a>
<input name="click" id="clickcounts" onclick="count()" value="0" type="text" size="5" />