Answer:
Using Javascript.
This method will use a function attached to a Button but you can call this at any point after the Form has loaded.
<script type="text/javascript">
function submit_form(id){
If(!id){ return false; }
document.getElementById(id).submit();
}
</script>
<form id="myform">
<input type="button" onclick="submit_form('myform');" />
</form>