var FormCheck = [];
/*
* Initialize form check: add event handler
* form = id of the form (<form id="")
* error = id of the global error message (<div id="")
*/
initFormCheck = function(form, error) {
    FormCheck.form = document.getElementById(form) ? document.getElementById(form) : form;
    FormCheck.error = document.getElementById(error) ? document.getElementById(error) : error;
    var el = FormCheck.form.getElementsByTagName("*");
    for (var i = 0; i < el.length; i++) {
        if (el[i].className && el[i].className.match("checkform")) {
            el[i].onsubmit = validateAll;
        }
        if (el[i].className && el[i].className.match("require") && !el[i].className.match("nocheck")) {
            el[i].onblur = validate;
            //el[i].onchange = validate;
        }
        if (el[i].type == "radio" || "checkbox") {
            if (!el[i].className.match("nocheck")) {
                el[i].onblur = function() {
                    validate.call(this);
                    return true;
                };
            }
        }
    }
}
/*
* Initializes form check for additional form part (activated by checkbox)
* switcher = id of the switching checkbox (needs the state)
* optionalpart = additional part to be or not to be displayed
* form = id of the form (<form id="")
* error = id of the global error message (<div id="")
*/
initOptionalCheck = function(switcher, optionalpart, form, error) {
    if (document.getElementById(form) && document.getElementById(optionalpart) && document.getElementById(error)) {
        if (switcher.checked) {
            document.getElementById(optionalpart).style.display = "block";
        } else {
            document.getElementById(optionalpart).style.display = "none";
        }
        var el = FormCheck.form.getElementsByTagName("*");
        for (var i = 0; i < el.length; i++) {
            if (el[i].className && el[i].className.match("optional")) {
                if (switcher.checked) {
                    el[i].onblur = validate;
                } else {
                    el[i].onblur = dummy;
                }
            }
        }
    }
}
/*
* no validation; must overwrite eventhandler
*/
dummy = function() {
    //no validation; must overwrite eventhandler
    return true;
}
/*
* validates all input fields of the form
*/
validateAll = function() {
    var result = "";
    var el = FormCheck.form.getElementsByTagName("*");
    for (var i = 0; i < el.length; i++) {

        if (el[i].className && el[i].className.match("require")) {
            result += this.validate(el[i]);
        }
        if (document.getElementById("optionalswitch") && document.getElementById("optionalswitch").checked) {
            if (el[i].className && el[i].className.match("optional")) {
                result += this.validate(el[i]);
            }
        }
    }
    if (result.indexOf('false') > -1) {
        return false;
    }
    return true;
}


/*
* validates one input field and returns true|false
* obj = input object
*/
validate = function(obj) {
    var errorBackground = "1px solid red";
    var defaultBackground = "1px solid #E8E4E1";
    var loader = (typeof (this.nodeName) == 'undefined') ? obj : this;
    var passok = true;
    var isOptional = false;
    var classItem = loader.className.split(' ');

    //blur function moved here
    if (loader.value == "") {
        loader.value = loader.title;
    }

    //optional: reset default background
    if (loader.parentNode != null && loader.parentNode.className != "form-submit") {
        if (loader.className.indexOf("require") > -1) {
            loader.style.border = defaultBackground;
        }
    }
    for (var i = 0; i < classItem.length; i++) {
        if (classItem[i] == "empty") isOptional = true;
    }
    if (isOptional && loader.value == "") return true;

    for (var i = 0; i < classItem.length; i++) {
        switch (classItem[i]) {
            case "notempty":
                passok = passok && (loader.value != "" && loader.value != loader.title);
                break;
            case "email":
                passok = passok && (loader.value.match(/^[\w\.\-\,\+]+@[a-zA-Z0-9][\w\.-]*[a-zA-Z0-9]\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]$/) != null);
                break;
            case "num":
                passok = passok && (loader.value.match(/^\d+$/) != null);
                break;
            case "agree":
                passok = passok && loader.checked;
                break;
            case "radio":
            case "checkbox":
                passok = passok && checkRadio.call(loader);
                break;
            case "password":
                passok = passok && checkPassword.call(loader);
                break;
            case "nospace":
                passok = passok && (loader.value.indexOf(" ") < 0);
                break;
            default:
                //no validation
                break;
        }
    }
    if (passok != true) {
        displayWarning.call(loader, "block");
        //optional: set error background
        loader.style.border = errorBackground;
    } else {
        displayWarning.call(loader, "none");
    }
    return passok;
}
/*
* function to submit the form
*/
formCheckSubmit = function(TEHForm) {
    displayWarning("none", FormCheck.error);
    if (validateAll()) {
        document.forms[TEHForm].submit();
        return true;
    } else {
        displayWarning("block", FormCheck.error);
        return false;
    }
}
/*
* check a radio button
*/
checkRadio = function() {
    var el = FormCheck.form.getElementsByTagName("input");
    for (var i = 0; i < el.length; i++) {
        if (el[i].name == this.name && el[i].checked) {
            return true;
        }
    }
    return false;
}
/*
* check all password fields to be equal (className password and classNames must be equal)
*/
checkPassword = function() {
    var el = FormCheck.form.getElementsByTagName("input");
    for (var i = 0; i < el.length; i++) {
        if (el[i].type == this.type && el[i].className == this.className) {
            if (el[i].value == "" || this.value == "" || el[i].value != this.value) {
                el[i].style.border = "1px solid #666";
                return false;
            } else {
                el[i].style.border = "1px solid #fff";
            }
        }
    }
    return true;
}
/*
* displays a warning for each field (must have the same parent as the object)
*/
displayWarning = function(state, obj) {
    if (obj) {
        obj.style.display = state;
    } else {
        if (this.parentNode.childNodes.length != 0) {
            for (var i = 0; i < this.parentNode.childNodes.length; i++) {
                if (this.parentNode.childNodes[i].className && this.parentNode.childNodes[i].className.match("warning")) {
                    this.parentNode.childNodes[i].style.display = state;
                }
            }
        }
    }
}