You can use Javascript, I assume that this is an ASP form (runat=server).
Most ASP controls are rendered as html controls on the actual page so to get the object through javascript you use objectid.ClientID
Example
<html>
<head>
<title>Example Page</title>
</head>
<body>
<form id="myForm" runat="server">
</form>
</body>
</html>
to submit this form through javascript and ASP
<script type="text/javascript">
document.forms['<%=myForm.ClientID%>'].submit();
</script>
Hope this helps