function ajaxFunction()
{
var xmlHttp=null;
  try
    {
    // Firefox, Opera 8.0+, Safari
    xmlHttp=new XMLHttpRequest();
    }
  catch (e)
    {
    // Internet Explorer
    try
      {
      xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
      }
    catch (e)
      {
      xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
      }
    }
  return xmlHttp;
}

function ajaxSel($url,url_name,y_id) {
	var url  = $url+"?conn="+url_name;
	var ajax = ajaxFunction();
	ajax.open("GET",url,true);
	ajax.onreadystatechange = function(){
		if(ajax.readyState == 4){
			document.getElementById(y_id).innerHTML = ajax.responseText;
		}
	}
    ajax.send(null);
}
function Ajax_Guo($url,x_id,y_id){
	var ss = document.getElementById(x_id).value;
	if(ss!=''){
		ajaxSel($url,ss,y_id);
	}
}

function Get_center(userid) {
	var url  = "get_center.php?id="+userid;
	var ajax = ajaxFunction();
	ajax.open("GET",url,true);
    ajax.send(null);
}
var re_value;
function ajaxPwd($url,url_name) {
	var url  = $url+"?conn="+url_name;
	var ajax = ajaxFunction();
	ajax.open("GET",url,true);
	ajax.onreadystatechange = function(){
		if(ajax.readyState == 4){
			re_value = ajax.responseText;
		}
	}
    ajax.send(null);
}