String.prototype.endsWith = function(str)
{return (this.match(str+"$")==str)}

function trim(str, chars) {
	return ltrim(rtrim(str, chars), chars);
}

function ltrim(str, chars) {
	chars = chars || "\\s";
	return str.replace(new RegExp("^[" + chars + "]+", "g"), "");
}

function rtrim(str, chars) {
	chars = chars || "\\s";
	return str.replace(new RegExp("[" + chars + "]+$", "g"), "");
}

function submitButtonEnabling() {
    document.getElementById("submitForm").disabled = false;

    for (var i in document.forms["registerForm"]) {
//        for (var j in document.forms["registerForm"][i]) {
//            alert(j);
//        }
        var obj = document.forms["registerForm"][i];
        if (obj && obj.tagName && (!obj.type || obj.type.toUpperCase() != "SUBMIT") && obj.tagName.toUpperCase() == "INPUT"){
            img = document.getElementById(obj.name + "Image");
            if (img.src.endsWith("error.png")) {
                document.getElementById("submitForm").disabled = true;
            }
        }

    }
}

function verify(val, errorPict) {
    var image = document.getElementById(val.name + "Image");
    var regex = new RegExp(val.alt);
    var result = regex.exec(val.value);
    if (result != null)
        image.src = "images/ok.png";
    else
        image.src = "images/" + errorPict + ".png";

    submitButtonEnabling();

}

function verifyLoginAvailability(url) {
    var loginInput = document.getElementById("login");
    //loginInput.value = url + loginInput.value;
    document.getElementById("hiddenframe").src = url + loginInput.value;
}

function loadVerificationFrame() {
    var pict = document.getElementById("hiddenframe").contentDocument.body.innerHTML;
    var verificationImage = document.getElementById("verificationImage");
    if (trim(pict) == "images/ok.png") {
        verificationImage.src = "images/ok.png";
    } else {
        verificationImage.src = "images/error.png";
    }

    submitButtonEnabling();

    //var s = "";
    //for (var i in document.getElementById("hiddenframe").contentDocument)
    //    s += i + " ";
    //alert();
    //document.getElementById("login").value = window.frames["hiddenframe"].document.innerHTML;
}

function onFormLoad() {

    for (var i in document.forms["registerForm"]) {
//        for (var j in document.forms["registerForm"][i]) {
//            alert(j);
//        }
        var obj = document.forms["registerForm"][i];
        if (obj && obj.tagName && (!obj.type || (obj.type.toUpperCase() != "SUBMIT" && obj.type.toUpperCase() != "BUTTON")) && obj.tagName.toUpperCase() == "INPUT"){
            var image = document.getElementById(obj.name + "Image");
            if (image.src.endsWith("error.png"))
                verify(obj, "error");
            else
                verify(obj, "warning");
        }

    }

    verifyLoginAvailability('https://polapgen.pl/login-available.php?login=');
}