I searched and found the nice code from here. Submit a form using jQuery
<input type='button' value='Submit form' onClick='submitDetailsForm()' />
<script language ="javascript" type = "text/javascript" >
function submitDetailsForm()
{
$("#formId").submit();
}
</script>
But can you please advise how to deal with multiple form within a page such?
<form id="myForm1" action="comment.php" method="post"></form>
<form id="myForm2" action="comment.php" method="post"></form>
<form id="myForm3" action="comment.php" method="post"></form>
<form id="myForm4" action="comment.php" method="post"></form>