Try writing a javascript function, using the properties of your form. Something like this:
function doSubmit(theForm)
{
theForm.action = "some_file.php";
theForm.method = "post";
theForm.submit();
return true;
}
and in your html you can put anything that can be put in an onClick event handler, so you can call your function always the user clicks it. Like:
<a href="javascript:;" onClick="return doSubmit(document.your_form)">submit</a>
O'k, let me know if this is works for you.