function createRequestObject(){
var req;
if(window.XMLHttpRequest){
//For Firefox, Safari, Opera
req = new XMLHttpRequest();
}
else if(window.ActiveXObject){
//For IE 5+
req = new ActiveXObject("Microsoft.XMLHTTP");
}
else{
//Error for an old browser
alert('Your browser is not IE 5 or higher, or Firefox or Safari or Opera');
}

return req;
}

//Make the XMLHttpRequest Object
var http = createRequestObject();

function sendRequest(method, url, value) {
    if (value != null && value != "" && value != " " && (method == 'get' || method == 'GET')) {
        http.open(method, url);
        http.onreadystatechange = handleResponse;
        http.send(null);
    }
}

function handleResponse(){
document.getElementById("emailValidate").innerHTML = "<img src='/loading-animation.gif'> checking..";
if(http.readyState == 4 && http.status == 200){
var response = http.responseText;
if(response){
document.getElementById("emailValidate").innerHTML = response;
}
}
}