= "Netscape")) {
     BigInteger.prototype.am = am1;
     dbits = 26;
     }
     else { // Mozilla/Netscape seems to prefer am3
     BigInteger.prototype.am = am3;
     dbits = 28;
     }
     */

    BigInteger.prototype.DB = dbits;
    BigInteger.prototype.DM = ((1 << dbits) - 1);
    var DV = BigInteger.prototype.DV = (1 << dbits);

    var BI_FP = 52;
    BigInteger.prototype.FV = Math.pow(2, BI_FP);
    BigInteger.prototype.F1 = BI_FP - dbits;
    BigInteger.prototype.F2 = 2 * dbits - BI_FP;

// Digit