if (screen.width >= "1024") {
document.write('<link rel="stylesheet" href="principal.css" type="text/css" />')
}
if (screen.width == "800") {
document.write('<link rel="stylesheet" href="folhaferr800.css" type="text/css" />')
}
if (screen.width == "1280") {
document.write('<link rel="stylesheet" href="folhaferr1280.css" type="text/css" />')
}