gistfile1.html

<div class='some-inline-input'>
  <p>Please enter some text in this box, then submit it!</p>
  <textarea id="posted_text"></textarea>
  <a class="post-text" href="/post/to/this/url">submit text with a POST request</a>
</div>

<script>
  $('.post-text').click(function() {
	var target = $(this)
	
	$.post({ 
		url: target.attr('href'), 
		data: $('#posted_text'), 
		success: function(data) {
			alert(data);
		}
	});
	
	return false;
  });
</script>