//carrega o jquery
document.write('<script type="text/javascript" src="http://www.unilestemg.br/portal/jsquery/jquery.js"></script>');
//carrega o pacote lightbox
document.write('<script type="text/javascript" src="http://www.unilestemg.br/portal/jsquery/jquery.lightbox-0.5.pack.js"></script>');
//carrega o css
document.write('<link rel="stylesheet" type="text/css" href="http://www.unilestemg.br/portal/jsquery/jquery.lightbox-0.5.css" media="screen" />');
//executa
document.write('<script type="text/javascript" src="http://www.unilestemg.br/portal/jsquery/chamada.js"></script>');