Sure you can use the submit() method to submit a form like this:
<a href="#" onclick="document.FormName.submit()">Submit Form</a>
Or
<a href="#" onclick="document.getElementById('formID').submit()">Submit Form</a>
To go unobstrusive, you can do this instead:
HTML:
You can give your link an id:
<a href="#" id="link">Submit Form</a>
Javascript:
<script type="text/javascript">
var link = document.getElementById('link');
link.onclick = function(){
document.getElementById('formID').submit();
return false;
};
</script>
where formID is the id of the form.