function popUp(foto,titulo,ancho,alto) {
//day = new Date();
//id = day.getTime();
id="galeria";
posX = (screen.availWidth - ancho )/2;
posY = (screen.availHeight - alto)/2;
eval("page" + id + " = window.open('popup.php?foto=" + foto + "&titulo=" + titulo + "','" + id + "', 'toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=0,width=" + ancho +",height=" + alto + ",left=" + posX + ",top=" + posY + "');");

}