function updateSubscribe()
{
    var name = document.getElementById('myName').value;
    var email = document.getElementById('myEmail').value;
    if(name=='' || email=='' || name.length<3 || email.length<5)
    {
        alert("Please enter correct values for 'Name' and 'Email' fields.");
        return false;
    }
    if(window.XMLHttpRequest)
    {
    // Code for IE7+, Firefox, Chrome, Opera, Safari
        xmlhttp = new XMLHttpRequest();
    }
    else
    {
    // Code for IE6, IE5
        xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
    }
    xmlhttp.onreadystatechange = function()
    {
        if(xmlhttp.readyState==4 && xmlhttp.status==200)
        {
            alert("Thank you for subscribing to our monthly newsletter.");
        }
    }
    xmlhttp.open("GET", "./subscribe.php?name="+name +"&email="+email, true);
    xmlhttp.send();
}