var simple_http = false;

if(navigator.appName == "Microsoft Internet Explorer") {
  simple_http = new ActiveXObject("Microsoft.XMLHTTP");
} else {
  simple_http = new XMLHttpRequest();
}


function simple_check_user_name(url, obj, update) {
	url = url + "user_name:" + obj.value;
  simple_http.open("GET", url, true);
	document.getElementById(update).innerHTML = "Checking User Name...";
  simple_http.onreadystatechange = function() {
    if(simple_http.readyState == 4) {
      document.getElementById(update).innerHTML = simple_http.responseText;
    }
  }
  simple_http.send(null);
}


function simple_check_user_name_when_update(url, obj, update, id) {
	url = url + "user_name:" + obj.value + "/id:" + id;
  simple_http.open("GET", url, true);
	document.getElementById(update).innerHTML = "Checking User Name...";
  simple_http.onreadystatechange = function() {
    if(simple_http.readyState == 4) {
      document.getElementById(update).innerHTML = simple_http.responseText;
    }
  }
  simple_http.send(null);
}