In our last session, we showed how to list the ad banner data and client data. In this session, we will examine the form that allows administrators to enter ad banner data. First, we include the class_ads.php file and instantiate the ads class: <?php require_once("class.ads.php"); // instantiate ads class $oAds = new ads; Next, we assign a value for the $id variable by suing the setID function in the ads class: // check for id if ($id) { // assign unique id $oAds->setId($id); } If the form has posted...