submit form automatically javascript

1<form name="myForm" id="myForm" target="_myFrame" action="test.php" method="POST">
2    <p>
3        <input name="test" value="test" />
4    </p>
5    <p>
6        <input type="submit" value="Submit" />
7    </p>
8</form>
9
10<script type="text/javascript">
11    window.onload=function(){
12        var auto = setTimeout(function(){ autoRefresh(); }, 100);
13
14        function submitform(){
15          alert('test');
16          document.forms["myForm"].submit();
17        }
18
19        function autoRefresh(){
20           clearTimeout(auto);
21           auto = setTimeout(function(){ submitform(); autoRefresh(); }, 10000);
22        }
23    }
24</script>
25