function initapp() {
    $("#username").val("adresa@domena.cz");
    $("#username").css("color","Silver");
    $("#username").click(clearVal);
    $("#username").focus(clearVal);
}

function clearVal() {
    $("#username").unbind("click", clearVal);
    $("#username").unbind("focus", clearVal);
    $("#username").css("color","WindowText");
    $("#username").val("");
}

function cpregen() {
    var rnd = new Date();
    var url = "jcaptcha.png?" + rnd.getTime();
    $("#cpid").attr("src", url);
    return false;
}