function createRequestObject() {
    var ro;
    var browser = navigator.appName;
    if(browser == "Microsoft Internet Explorer"){
        ro = new ActiveXObject("Microsoft.XMLHTTP");
    }else{
        ro = new XMLHttpRequest();
    }
    return ro;
}

var http = createRequestObject();
var p_id="";
function getusername(target) {


    http.open('get', 'ajax_response.aspx?username='+target.value);
    http.onreadystatechange = handleResponse;
    http.send(null);
}

 

function handleResponseImage() {
    if(http.readyState == 4){
        var response = http.responseText;
            document.getElementById(p_id).innerHTML = response;
         
    }
}
function clearcell(){
document.getElementById("isuser").innerHTML = "";
}
function handleResponse() {
    if(http.readyState == 4){
        var response = http.responseText;
            document.getElementById("isuser").innerHTML = response;
         
    }
}