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)
{
    if(method == 'get' || method == 'GET')
    {
        http.open(method,url);
        http.onreadystatechange = handleResponse;
        http.send(null);
    }
}

function sendRequestPost(method, url, params)
{
    if(method == 'post' || method == 'POST')
    {
        http.open(method,url);
        http.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
        http.setRequestHeader("Content-length", params.length);
        http.setRequestHeader("Connection", "close");
        http.onreadystatechange = handleResponse;
        http.send(params);
    }
}


function handleResponse()
{
    if(http.readyState == 4 && http.status == 200)
    {
        var response = http.responseText;
        if(response)
        {
            document.getElementById("ajax_res").innerHTML = response;
        }
    }
}