<script type="text/javascript">
    function calcMinExam() {
        var first = document.minExam.first.value;
        var second = document.minExam.second.value;
        var ne = /^[0-9]+$/;
        if(first.match(ne) && second.match(ne)) {
            var minA = (8950/15) - (43/15)*first - (42/15)*second;
            var minB = (7950/15) - (43/15)*first - (42/15)*second;
            var minC = (7450/15) - (43/15)*first - (42/15)*second;
            var minD = (6950/15) - (43/15)*first - (42/15)*second;
            document.write("<h3> Results: </h3>");
            document.write(minA+" to get an A<br />"+minB+" to get a B<br />"+minC+" to get a C<br />"+
            minD+" to pass");
            document.write("<p><a href=\"javascript:location.reload(true)\">Back</a></p>");
        } else {
            alert("Error: You must enter valid number grades.");
        }
    }
    function calcFinalAvg() {
        var first = document.finalAvg.first.value;
        var second = document.finalAvg.second.value;
        var exam = document.finalAvg.exam.value;
        var ne = /^[0-9]+$/;
        if(first.match(ne) && second.match(ne) && exam.match(ne)) {
            var semAvg = Math.round(.43*first + .42*second + .15*exam);
            document.write("<h3> Results: </h3>");
            document.write("Semester Average: "+semAvg);
            document.write("<p><a href=\"javascript:location.reload(true)\">Back</a></p>");
        } else {
            alert("Error: You must enter valid number grades.");
        }
    }
</script>