function popUp(url_used,w,h) {
day = new Date();
id = day.getTime();
eval("page" + id + " = window.open(url_used, '" + id + "', 'dependent=1,toolbar=0,scrollbars=1,location=0,statusbar=0,menubar=0,resizable=0,width='+ w +',height=' + h);");
}