[jQuery] jQuery .post and.load with some PHP

[Good Knight]

Okay, so I have This PHP code.
It creates a list of all the categories from database and it creates a
div with all the items from the database. Each item is associated with
a category id as to which category it is apart of. The list of
categories should be clicked on and then the jQuery will run a post of
the category id and then reload the list of items to only show items
in the selected category.

if(!empty($_POST) || $catSortID != "") {
        $catSortID = $_POST['catSortID'];
        $catSortItem = " WHERE category_id = " . $catSortID;
} else {
        $catSortItem = "";
}

$catList = mysql_query("SELECT * FROM adminCategory ORDER BY
CategoryName");

$catLinks = array();
while ($catlistRow = mysql_fetch_array($catList)) {
   $catLinks[] = '<a href="javascript:;" class="sortCat" id="sortCat_'.
$catlistRow['id'].'" onclick="sortItemCat('.$catlistRow['id'].')">'.
$catlistRow['CategoryName'] .'</a>';
}

echo "<p id=\"catSortList\">" . implode(' | ', $catLinks) . "</p>\n
\n";



$result = mysql_query('SELECT * FROM adminItems'.$catSortItem.' ORDER
BY id');
while ($row = mysql_fetch_array($result)) {
        $textmsg = $line = str_replace("|", "</li><li>", $row['textmsg']);
        $catID = $row['category_id'];
        $catsql = "SELECT * FROM adminCategory WHERE id = " . $catID;
        $catName = mysql_query($catsql);
        while ($catRow = mysql_fetch_array($catName)) {
                print '<div id="Item_' . $row['id'] . '" class="itemListBox">
                                        <img 
src="../content/img/items/imgresize.php?src=../content/'.$row
['image_url'].'&w=100" alt="'.$row['name'].'" title="'.$row['name'].'"
class="itemListImg" />
                                        <div><h3 class="itemTitle">' . 
$catRow['CategoryName'] . '
&raquo; '.$row['name'].'</h3>
                                        <p 
class="itemDesc"><strong>Description: </strong>'.$row
['description'].'</p>
                                        <p class="itemMsg"><strong>Text 
Message(s): </strong></p>
                                        <ol 
class="itemMsgList"><li>'.$textmsg."</li></ol></div>
                                </div>\n\n";
        }
}

Problem is, whenever jQuery runs a post and then loads it, it never
returns with only the selected category items.

function sortItemCat(id) {
        var catList = $("#sortCat_"+id).text();
        $.post('lib/loadItem.php', { catSortID: id }, function(data) {
                if(dataq){
                        $("#itemList").load("lib/loadItem.php");
                }else{alert(data+" -- "+id+" -- "+catList);}
        });
}

Any idea as to what might be going on?