var totalPages = 2;

function goToPage(n) {
    if (n == "") {
        alert("Page number cannot be blank");
        return false;
    } else {
        if ((n <= 0) || (n > totalPages)) {
            alert("The page number does not exist.");    
            return false;
        } else {
            if (n == 1) {
                var finalURL = "foot.html";
            } else {
                n = n -1;
                var finalURL = "foot" + n + ".html";
            }
            window.location.href = finalURL;
        }
    }
}