[jQuery] get form input value!

.js[code]
var Comment = {
onCommentSubmit:function( el, url, targetEl ) {
var data = $(el).serialize();
var type = "POST";
Star.ajax( type, el, url, data, targetEl );
return false;
}

}
var Star = {
ajax:function( type, el, url, data, targetEl ) {
$.ajax({
type: type,
beforeSend:function(){
$(el).children(".button_parent").hide();
$(el).children(".ajax_loader").show();
},
url: url,
data: data,
success:function(txt){
$(el).children(".ajax_loader").hide();
$(el).children(".button_parent").show();
if(txt == "OK") {
loadContents(targetEl, "/p_gamma/news/rq/r_latest_comments.php?
id=" + $(el).children("input[name='id']").val());
}
},
error:function(txt){
$(el).children(".ajax_loader").hide();
$(el).children(".button_parent").show();
}
});

return false;
}
}[/code]
[code]<form method="post" id="add_comment" action="/p_gamma/news/"
onsubmit="Comment.onCommentSubmit(this, '/p_gamma/news/rq/
p_comments.php', '#ncomment_response'); return false;">
<input name="id" type="hidden" value="<? echo $get_news['id'] ?>" />
<textarea class="textarea" cols="25" name="comment" rows="4"
onkeyup="Comment.remainingChars(this, event);"></textarea>
<input type="submit" id="submit_comment" value="Add comment" />
</form>[/code]

Is the js/jquery ok? Can i short something or make better?
But the problem I've is here:
[code]loadContents(targetEl, "/p_gamma/news/rq/r_latest_comments.php?
id=" + $(el).children("input[name='id']").val());[/code]
How to get el (in this case el is 'this' which is form) input, which
name=id value? It returns me 'undefined' because i think my mistake is
here: $(el).children("input[name='id']").val(), bet viss pārējais
darbojas.