// make all links with the 'rel' attribute open overlays

$(function() {

    // if the function argument is given to overlay,
    // it is assumed to be the onBeforeLoad event listener
    $("a[rel]").overlay({

        // If you want to dim the background, uncomment the mask
        // mask: '#555',
        effect: 'apple',

        onBeforeLoad: function() {

            // load the page specified in the trigger
            document.getElementById("adioverlay").src=this.getTrigger().attr("href");
        }

    });
});