// JavaScript Document
$(function() {  
    // if the function argument is given to overlay, it is assumed to be the onBeforeLoad event listener 
    $("a[rel]").overlay(function() {
        // grab wrapper element inside content 
        var wrap = this.getContent().find("div.wrap"); 
        // load only for the first time it is opened
	    var dest = this.getTrigger().attr("href");
        if (wrap.is(":empty")) {
            wrap.load(dest);
        }
		else {
			wrap.unload();
			wrap.load(dest);
		}
    });
});