function run_demo() {
    var str = "";
    var res = document.getElementById("result");
    //
    for (var a = 1; a < 10; a++)
        for (var b = 0; b < 10; b++)
            for (var c = 0; c < 10; c++) {
                if ((a * a + b * b) === c * c) {
                    str += "<p>" + a + b + c + " " + a + "<sup>2</sup>+" + b + "<sup>2</sup>=" + c + "<sup>2</sup></p>\n";
                }
            }
    res.innerHTML = str;
}