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<script type="text/javascript">
var Bildschirmaufloesung = screen.width;

if (Bildschirmaufloesung >= "1024")
{
location.href = "version1.html";
}
else if (Bildschirmaufloesung >= "800")
{
location.href = "version2.html";
}
else
{
location.href = "version3.html";
}
</script>