function popUp(URL, Xesc, Yesc) {
day = new Date();
id = day.getTime();

//Xesc = 790;
//Yesc = 536;
Xpos = 0;
Ypos = 0;

eval("page" + id + " = window.open(URL, '" + id + "', 'toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=0,width='+Xesc+',height='+Yesc+',left ='+Xpos+',top='+Ypos);");
}