Problem displaying textarea array

[bytesize]

I can't figure out how to make - textarea[name=send[mc_comment]] - work.

When I add text to send[mc_comment] it only works on the first post comment and the other post comments are empty!
Can anyone help me with this?

a, b, c, d, e work as they should. $curpost = postid in the database.

<script type="text/javascript">
	var commentUrl = "views/layouts/comments.php";
	function mainComment(a,b,c,d,e,f) {
		var f = $("textarea[name=send[mc_comment]]").val();
		var page = (d);
		$("#"+page).text("Please wait...").show();
		$.post(commentUrl,{user:a, friend:b, postid:c, where:d, which:e, send:f},function(data){$("#"+page).html(data).show().fadeOut(1000)})
	}
</script>

<form action="" method='POST'>
  <textarea name='send[mc_comment]'></textarea>
  <a href='#' onclick="return false" onmousedown="javascript:mainComment('<?php echo $usercode; ?>', '<?php echo $othermember; ?>', '<?php echo $curpost; ?>', '<?php echo 'add'.$curpost; ?>', '<?php echo $comment; ?>');">Yes</a>
</form>