var http_request = false;

   function makeRequest() {
       if (window.XMLHttpRequest) { // Mozilla, Safari,...
           http_request = new XMLHttpRequest();
       } else if (window.ActiveXObject) { // IE
           http_request = new ActiveXObject("Microsoft.XMLHTTP");
       }
           var theUsername = document.getElementById('user_ip').value;
       http_request.onreadystatechange = alertContents;
       http_request.open('POST', 'myajax.php?do=check');
       http_request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
       http_request.send("user_ip="+theUsername);

   }

   function alertContents() {

       if(http_request.readyState == 1){
        document.getElementById('showithere').innerHTML = '<img src="ajax-loader.gif">جاري جلب البيانات...';
    }
       if (http_request.readyState == 4) {
           if (http_request.status == 200) {
               document.getElementById('showithere').innerHTML = http_request.responseText;
           } else {
                document.getElementById('showithere').innerHTML ='There was a problem with the request.';
           }
       }

   }