¿Necesitas ayuda en la toma de las cabeceras de hacer clic y ordenar

<?php

if ($_POST){

    $county = $_POST['county'];
    $rooms = $_POST['type'];
    $rent = $_POST['rent'];
    $rent_min = $rent - 500;
}
    
    $dbase = mysql_connect ( ' ', ' ', ' ' );
    mysql_select_db ( ' ', $dbase );
            
    if($county){
        $sql = "SELECT * FROM `apartments` WHERE `county` = '".$county."' AND `rooms` = '".$rooms."' AND `rent` < '".$rent."' AND `rent` > '".$rent_min."' ";
    }else{
        $sql = "SELECT * FROM `apartments`";
    }           
    //include the class
require_once("/home/genesis/php/HTML/Table.php");

//set table attributes
$attributes = array("width"=>"600","border"=>"1", "align"=>"center");

//create the table class
$table = new HTML_Table($attributes);

//build our first row
$contents = array("County", "Town", "Phone Number", "Rooms", "Baths", "Rent");
$attributes = array("bgcolor"=>"#336699");
$table->addRow($contents, $attributes, "TH");

//loop through and add our data
$attributes = array("bgcolor"=>"#COCOCO");

    $res = mysql_query($sql, $dbase);
    
        while($row = mysql_fetch_assoc($res)) {
    $contents = array($row['county'], $row['town'], $row['phone'], $row['rooms'], $row['bath'], $row['rent'],);
    $table->addRow($contents, $attributes);
}
$table->altRowAttributes(1, null, array("class"=>"alt"));
$table->display();
?>