var stylesheet, breite;

if (window.innerWidth) {
 breite = window.innerWidth;
} else {
 breite = document.body.clientWidth;
}

if (breite<=608) {
 stylesheet = 'css/position1024.css'
}
else if (breite<=760) {
 stylesheet = 'css/position1024.css';
}
else if (breite <=960) {
 stylesheet = 'css/position1024.css';
}
else if (breite <=1200) {
 stylesheet = 'css/position1024.css';
}
else {
 stylesheet = 'css/position1280.css';
}

document.writeln('<style type="text/css"><!-- @import url(' + stylesheet + '); --> </style>');

// Zum Umschalten per Link
function demo(x, y) {
 window.resizeTo(x, y);
 location.reload();
}