Number.prototype.fraction = fraction;
function fraction(decimal) {
    if (!decimal) {
        decimal = this;
    }
    whole = String(decimal).split('.')[0];
    decimal = parseFloat("." + String(decimal).split('.')[1]);
    num = "1";
    for (z = 0; z < String(decimal).length - 2; z++) {
        num += "0";
    }
    decimal = decimal * num;
    num = parseInt(num);
    for (z = 2; z < decimal + 1; z++) {
        if (decimal % z == 0 && num % z == 0) {
            decimal = decimal / z;
            num = num / z;
            z = 2;
        }
    }
    return ((whole == 0) ? "" : whole + " ") + decimal + "/" + num;
}