function validateEmail(addr, man, db) 
{
    if (addr == '' && man) {
        if (db) alert('Please enter your email address');
        return false;
    }
    var invalidChars = '\/\'\\ ";:?!()[]\{\}^|';
    for (i = 0; i < invalidChars.length; i++) {
        if (addr.indexOf(invalidChars.charAt(i), 0) > -1) {
            if (db) alert('email address contains invalid characters');
            return false;
        }
    }
    for (i = 0; i < addr.length; i++) {
        if (addr.charCodeAt(i) > 127) {
            if (db) alert("email address contains non ascii characters.");
            return false;
        }
    }

    var atPos = addr.indexOf('@', 0);
    if (atPos == -1) {
        if (db) alert('email address must contain an @');
        return false;
    }
    if (atPos == 0) {
        if (db) alert('email address must not start with @');
        return false;
    }
    if (addr.indexOf('@', atPos + 1) > -1) {
        if (db) alert('email address must contain only one @');
        return false;
    }
    if (addr.indexOf('.', atPos) == -1) {
        if (db) alert('email address must contain a period in the domain name');
        return false;
    }
    if (addr.indexOf('@.', 0) != -1) {
        if (db) alert('period must not immediately follow @ in email address');
        return false;
    }
    if (addr.indexOf('.@', 0) != -1) {
        if (db) alert('period must not immediately precede @ in email address');
        return false;
    }
    if (addr.indexOf('..', 0) != -1) {
        if (db) alert('two periods must not be adjacent in email address');
        return false;
    }
    var suffix = addr.substring(addr.lastIndexOf('.') + 1);
    if (suffix.length != 3) {
        if (db) alert('invalid primary domain in email address');
        return false;
    }
    if (suffix.length == 3 && suffix != 'com' && suffix != 'net' && suffix != 'org' && suffix != 'edu' && suffix != 'int' && suffix != 'mil' && suffix != 'gov' & suffix != 'arpa' && suffix != 'biz' && suffix != 'aero' && suffix != 'name' && suffix != 'coop' && suffix != 'info' && suffix != 'pro' && suffix != 'museum') {
        if (db) alert('invalid primary domain in email address');
        return false;
    }
    return true;
}

function fncheckEnquiry(elprefix) {
    if (document.getElementById(elprefix + "tbxProspectEmail").value == "") {
        alert("Please enter your email.");
        document.getElementById(elprefix + "tbxProspectEmail").focus();
        return false;
    }
    if (validateEmail(document.getElementById(elprefix + "tbxProspectEmail").value, 1, 0) == false) {
        alert("Your email address appears not to be in the correct format.  Please check.");
        document.getElementById(elprefix + "tbxProspectEmail").focus();
        return false;
    }
    if (document.getElementById(elprefix + "tbxMessage").value == "") {
        alert("Please enter your message.");
        document.getElementById(elprefix + "tbxMessage").focus();
        return false;
    }
    if (document.getElementById("tbxEmail2").value != "Do not enter text please") {
        alert("You must be a real person.");
        document.getElementById(elprefix + "tbxMessage").focus();
        return false;
    }
    return true;
}