<!DOCTYPE HTML>
<html>
<head>
<script type="text/javascript">
function write_sum()
{
x=5
y=3
document.forms["sumform"]["sum"].value=x+y
}
</script>
</head>
<body onload="write_sum()">
<form action="form_action.asp" method="get" name="sumform">
<output name="sum"></output>
</form>
</body>
</html>