size = "Blank";

function checkme() {
size = document.betelgeuse.answer.value - 0;
if (!size) {size = "Blank";}

RightOnFile = './betelgeuse-correct.html';
TryAgainFile = './betelgeuse-close.html';
WayWrongFile = './betelgeuse-wrong.html';

low_wrong = 0.0275;
low_good  = 0.0440;
hi_good   = 0.0665;
hi_wrong  = 0.0801;

if ((size != "Blank") && (size >= low_good) && (size <= hi_good)) {
    location = RightOnFile;
}
else if ((size == "Blank") || ((size < low_wrong) || (size > hi_wrong))) {
    location = WayWrongFile;
}
else {
    location = TryAgainFile;
}
}