connecting ajax and php not work

connecting ajax and php not work

what is the problem of this code? it is menu and page change by ajax with
out refreshing the page, but its not working it is my ajax code
<script>
$(document).ready(function() {
$('.news').click(function give(id){
$('#main-unit').text('Please Wait...');
var place= id;
$.ajax({
url:'pages/news.php',
type:'POST',
data:'where='+place,
statusCode:{
success: function(data){
$('#main-unit').html(data);
}
}
});
});
});
</script>
this is my html tags
<ul>
<li><a class="news" onclick=\"give('news')\" href="#">news</a></li>
</ul>
and php code
mysql_connect("localhost", "root", "")
or die(mysql_error());
mysql_select_db("basi")
or die(mysql_error());
if($_POST['where']=='news'){
$result = mysql_query("SELECT * FROM contents WHERE type = 0");
while ($row = mysql_fetch_array($result)){
$title = $row['title'];
$text = $row['text'];
echo"
<div class='title'><span>$title</span></div>
<div class='content'>
$text
</div>
";
}
}
the information read from DB but dont return to html file.