// JScript File
function checkValidation(emailAddr) {

    var message = 'OK';

    if (stringEmpty(emailAddr)) {
        message = "Error! There is no input value entered.";
    } else if (noAtSign( emailAddr )) {
        message = "Error! The address \"" + emailAddr + "\" does not contain an '@' character.";
    } else if (nothingBeforeAt(emailAddr)) {
        message = "Error! The address \"" + emailAddre;
        message += "\" must contain at least one character before the '@' character";
    } else if (noLeftBracket(emailAddr)) {
        message = "Error! The address \"" + emailAddr;
        message += "\" contains a right square bracket ']',\nbut no corresponding left square bracket '['.";
    } else if (noRightBracket(emailAddr)) {
        message = "Error! The address \"" + emailAddr;
        message += "\" contains a left square bracket '[',\nbut no corresponding right square bracket ']'.";
    } else if (noValidPeriod(emailAddr)) {
        message = "Error! The address \"" + emailAddr + "\" must contain a period ('.') character.";
    } else if (noValidSuffix(emailAddr)) {
        message = "Error! The address \"" + emailAddr;
        message += "\" must contain a two, three or four character suffix.";
    }
    return (message);
}

function checkEmailValid (formField) {
    if( checkValidation(formField) == 'OK')
        return true;
    return false;
}

function stringEmpty (formField) {
    // CHECK THAT THE STRING IS NOT EMPTY
    if ( formField.length < 1 ) {
        return ( true );
    } else {
        return ( false );
    }
}

function noAtSign (formField) {
    // CHECK THAT THERE IS AN '@' CHARACTER IN THE STRING
    if (formField.indexOf ('@', 0) == -1) {
        return ( true )
    } else {
        return ( false );
    }
}

function nothingBeforeAt (formField) {
    // CHECK THERE IS AT LEAST ONE CHARACTER BEFORE THE '@' CHARACTER
    if ( formField.indexOf ( '@', 0 ) < 1 ) {
        return ( true )
    } else {
        return ( false );
    }
}

function noLeftBracket (formField) {
    // IF EMAIL ADDRESS IN FORM 'user@[255,255,255,0]', THEN CHECK FOR LEFT BRACKET
    if ( formField.indexOf ( '[', 0 ) == -1 && formField.charAt (formField.length - 1) == ']') {
        return ( true )
    } else {
        return ( false );
    }
}

function noRightBracket (formField) {
    // IF EMAIL ADDRESS IN FORM 'user@[255,255,255,0]', THEN CHECK FOR RIGHT BRACKET
    if (formField.indexOf ( '[', 0 ) > -1 && formField.charAt (formField.length - 1) != ']') {
        return ( true );
    } else {
        return ( false );
    }
}

function noValidPeriod (formField) {
    // IF EMAIL ADDRESS IN FORM 'user@[255,255,255,0]', THEN WE ARE NOT INTERESTED
    if (formField.indexOf ( '@', 0 ) > 1 && formField.charAt (formField.length - 1 ) == ']')
        return ( false );

    // CHECK THAT THERE IS AT LEAST ONE PERIOD IN THE STRING
    if (formField.indexOf ( '.', 0 ) == -1)
        return ( true );

    return ( false );
}

function noValidSuffix(formField) {
    // IF EMAIL ADDRESS IN FORM 'user@[255,255,255,0]', THEN WE ARE NOT INTERESTED
    if (formField.indexOf('@', 0) > 1 && formField.charAt(formField.length - 1) == ']') {
        return ( false );
    }

    // CHECK THAT THERE IS A TWO OR THREE CHARACTER SUFFIX AFTER THE LAST PERIOD
    var len = formField.length;
    var pos = formField.lastIndexOf ( '.', len - 1 ) + 1;
    if ( ( len - pos ) < 2 || ( len - pos ) > 4 ) {
        return ( true );
    } else {
        return ( false );
    }
}