size1 = "Blank";
size2 = "Blank";

function checkme() {
size1 = document.ang_prac.answer1.value - 0;
if (!size1) {size1 = "Blank";}
size2 = document.ang_prac.answer2.value - 0;
if (!size2) {size2 = "Blank";}

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

low1  = 8.58;
hi1   = 8.60;
low2  = 3.43;
hi2   = 3.45;

if (((size1 != "Blank") && (size1 >= low1) && (size1 <= hi1)) &&
    ((size2 != "Blank") && (size2 >= low2) && (size2 <= hi2))) {
    location = RightOnFile;
}
else if (((size1 == "Blank") || ((size1 < low1) || (size1 > hi1))) &&
         ((size2 == "Blank") || ((size2 < low2) || (size2 > hi2))))
{
    location = WayWrongFile;
}
else {
    location = TryAgainFile;
}
}