function trim(str) {
    return str.replace(/^\s+|\s+$/g,'');
}

function verifyEmailDuplicated(field1,field2) {
    var val1 = trim(field1.value)
    var val2 = trim(field2.value)
    if (val1 != val2) {
        alert("Please re-enter your email address exactly as the first time");
        return false;
    }
    else if (val1.length == 0) {
        alert("Please enter your email address");
        return false;
    }
    return true;
}