function cargar_medidas_buenas() {
if ((screen.width == 800) && (screen.height == 600))
document.write("")
else if ((screen.width == 1024) && (screen.height == 768))
document.write("")
else if ((screen.width == 1152) && (screen.height == 864))
document.write("")
else if ((screen.width == 1280) && (screen.height == 1024))
document.write("")
}
cargar_medidas_buenas();