/**
* Set up variables to hold the parameters - therefore reduces the chances of spelling mistakes
*/
var isMandatory = 0;
var isEmail = 1;
var isCBMandatory = 2;
var isRadioMandatory = 3;
var isDropdownMandatory = 4;
var isTandCsMandatory = 5;
var MESSAGE_MANDATORY_ERROR = "The following field is mandatory";
var MESSAGE_MANDATORY_CB_ERROR = "Please select a checkbox";
var MESSAGE_MANDATORY_RADIO_ERROR = "Please select a radiobox";
var MESSAGE_MANDATORY_DROPDOWN_ERROR = "Please select from the drop down list";
var MESSAGE_MANDATORY_TANDCS_ERROR = "Please confirm you have read and agree to the Terms and Conditions";
var MESSAGE_EMAIL_ERROR = "The email address is not of the form \"name@address\"";
var fId = 0;


function SKM_validateForm(formID) {

    var foundError = false;
    /**
    * Loop through the element list until an error found
    */
    for (var i = 0; !foundError && i < fieldList.length; i++) {
        /**
        * Assign to "obj" the HTML object with the name of the first element of the array
        */
        var obj = MM_findObj(fieldList[i][0]);
        var name = fieldList[i][1];
        /**
        * Only proceed if the HTML object was found
        */
        if (obj != null) {
            /**
            * Loop through the parameter list until an error found
            * starting at 2 - i.e. ignore field name and English name
            */
            for (var j = 2; !foundError && j < fieldList[i].length; j++) {
                /**
                * Switch-case statement is more effecient and easier to read than "if, if else, else"
                */
                switch (fieldList[i][j]) {
                    case isMandatory:
                        foundError = check_Mandatory(obj, name);
                        break;
                    case isEmail:
                        foundError = check_Email(obj, name);
                        break;
                    case isCBMandatory:
                        foundError = check_MandatoryCB(obj, name);
                        break;
                    case isRadioMandatory:
                        foundError = check_MandatoryRadio(obj, name);
                        break;
                    case isDropdownMandatory:
                        foundError = check_MandatoryDropdown(obj, name);
                        break;
                    case isTandCsMandatory:
                        foundError = check_MandatoryTandCs(obj, name);
                        break;
                    default:
                        break;
                }
            }
        } else {
            alert("ADMIN: object not found \"" + fieldList[i][0] + "\"");
        }
    }
    if (!foundError) {
        return true;
    }
    else {
        return false
    }
}

/**
* check_Mandatory
*/
function check_Mandatory(obj, name) {
    var error = false;
    if (obj.value == null || obj.value == "") {
        error = true;
        alert(MESSAGE_MANDATORY_ERROR + "\n" + name);
        obj.focus();
    }
    return error;
}

/**
* check_MandatoryCB
*/
function check_MandatoryCB(obj, name) {
    var strCB = "";
    var error = false;
    var foundChecked = false;
    for (var i = 0; !foundChecked && i < obj.length; i++) {
        if (obj[i].checked) {
            foundChecked = true;
            strCB = strCB + obj[i].value + ", "
            document.form.Enquirystring.value = strCB
        }
    }
    if (!foundChecked) {
        error = true;
        alert(MESSAGE_MANDATORY_CB_ERROR + "\n" + name);
    }
    return error;
}

/**
* check_Email
* Acceptable entries <name>@<address>
*	where "name" & "address" can be made from letters, numbers and "_-." only
*/
function check_Email(obj, name) {
    var error = false;
    var v = obj.value;
    v = v.replace(/[a-zA-Z0-9_.-]/g, "A"); //convert all letters, numbers, & "_", "." & "-" to "A"
    v = v.replace(/AA+/g, "A"); 			//convert "AA" to "A"
    if (v != "A@A") {
        error = true;
        alert(MESSAGE_EMAIL_ERROR);
        obj.focus();
    }
    return error;
}
/**
* check_T's & C's confirmed
*	Single checkbox validation
*/
function check_MandatoryTandCs(obj, name) {
    var error = false;
    var foundChecked = false;

    if (obj.checked) {
        foundChecked = true
    }
    if (!foundChecked) {
        error = true;
        alert(MESSAGE_MANDATORY_TANDCS_ERROR);
    }
    return error;
}


/**
* check radio box selected
*
*/
function check_MandatoryRadio(obj, name) {
    var error = false;
    var foundChecked = false;

    for (var i = 0; !foundChecked && i < obj.length; i++) {
        if (obj[i].checked) {
            foundChecked = true
        }
    }
    if (!foundChecked) {
        error = true;
        alert(MESSAGE_MANDATORY_RADIO_ERROR + "\n" + name);
    }

    return error;
}
/**
* check item selected from drop down list
*
*/
function check_MandatoryDropdown(obj, name) {
    var error = false;
    var foundChecked = false;

    if (!obj.options[0].selected) {
        foundChecked = true
    }
    if (!foundChecked) {
        error = true;
        alert(MESSAGE_MANDATORY_DROPDOWN_ERROR + "\n" + name);
    }
    return error;
}

function MM_findObj(n, d) { //v4.01
    var p, i, x; if (!d) d = document; if ((p = n.indexOf("?")) > 0 && parent.frames.length) {
        d = parent.frames[n.substring(p + 1)].document; n = n.substring(0, p);
    }
    if (!(x = d[n]) && d.all) x = d.all[n]; for (i = 0; !x && i < d.forms.length; i++) x = d.forms[i][n];
    for (i = 0; !x && d.layers && i < d.layers.length; i++) x = MM_findObj(n, d.layers[i].document);
    if (!x && d.getElementById) x = d.getElementById(n); return x;
}