JavaScript - No puedo hacer submit por javascript

<form action="files.html" method="post">

	<textarea name="filecontent" class="editor">

	</textarea>

	<p id="filesubmit"><input type="submit" name="action" value="Save" title="Save file"></p>

</form>

$('form[action="files.html"]').submit()

var elem = $('form[action="files.html"]')[0]

var submitFormFunction = Object.getPrototypeOf(elem).submit;

    submitFormFunction.call(elem);

<SCRIPT type="text/javascript">function gotosite(){var URL = document.gotoform.url_list.options[document.gotoform.url_list.selectedIndex].value; window.location.href = URL;}</SCRIPT>

function gotosite(){

    var URL = document.gotoform.url_list.options[document.gotoform.url_list.selectedIndex].value;

    window.location.href = URL;

}

<script src="http://code.jquery.com/jquery-latest.js"></script>

<form action="files.html" method="post">

	<textarea name="filecontent" class="editor">

	</textarea>

	<p id="filesubmit"><input type="submit" name="action" value="Save" title="Save file"></p>

</form>

<script>

$('form[action="files.html"]').submit()

</script>

$('input[name="action"]').click()