var http_request = false;
   var requestid = '';
   function makeRequest(url,parameters) {
      http_request = false;
      if (window.XMLHttpRequest) { // Mozilla, Safari,...
         http_request = new XMLHttpRequest();
         if (http_request.overrideMimeType) {
         	// set type accordingly to anticipated content type
            //http_request.overrideMimeType('text/xml');
            http_request.overrideMimeType('text/html');
         }
      } else if (window.ActiveXObject) { // IE
         try {
            http_request = new ActiveXObject("Msxml2.XMLHTTP");
         } catch (e) {
            try {
               http_request = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e) {}
         }
      }
      if (!http_request) {
         alert('Cannot create XMLHTTP instance');
         return false;
      }
      http_request.onreadystatechange = alertContents;
      http_request.open('POST', url + parameters, true);
      http_request.send(null);
   }

   function alertContents() {
      if (http_request.readyState == 4) {
         if (http_request.status == 200) {
            //alert(http_request.responseText);
            result = http_request.responseText;
            document.getElementById(requestid).innerHTML = result;            
         } else {
            alert('There was a problem with the request.');
         }
      }
   }
   
   function get(obj,act,id) {
		var getstr = "&";
		requestid = id;
		
		for (i=0; i<obj.getElementsByTagName('textarea').length; i++)
			getstr += obj.getElementsByTagName('textarea')[i].name+"="+encodeURI(obj.getElementsByTagName('textarea')[i].value)+"&";
			
		for (i=0; i<obj.getElementsByTagName('select').length; i++)
			getstr += obj.getElementsByTagName('select')[i].name+"="+encodeURI(obj.getElementsByTagName('select')[i].value)+"&";
			
		for (i=0; i<obj.getElementsByTagName('input').length; i++) {
			if(obj.getElementsByTagName('input')[i].type=="radio")
				if(obj.getElementsByTagName('input')[i].checked)
					getstr += obj.getElementsByTagName('input')[i].name+"="+encodeURI(obj.getElementsByTagName('input')[i].value)+"&";

			if(obj.getElementsByTagName('input')[i].type=="checkbox")
				if(obj.getElementsByTagName('input')[i].checked)
					getstr += obj.getElementsByTagName('input')[i].name+"="+encodeURI(obj.getElementsByTagName('input')[i].value)+"&";
				else
					getstr += obj.getElementsByTagName('input')[i].name+"=&";
			
			if(obj.getElementsByTagName('input')[i].type=="hidden")
				getstr += obj.getElementsByTagName('input')[i].name+"="+encodeURI(obj.getElementsByTagName('input')[i].value)+"&";

			if(obj.getElementsByTagName('input')[i].type=="text")
				getstr += obj.getElementsByTagName('input')[i].name+"="+encodeURI(obj.getElementsByTagName('input')[i].value)+"&";
			
			if(obj.getElementsByTagName('input')[i].type=="password")
				getstr += obj.getElementsByTagName('input')[i].name+"="+encodeURI(obj.getElementsByTagName('input')[i].value)+"&";

			//         if (obj.getElementsByTagName('input')[i].tagName == "input") {
			/*if (obj.childNodes[i].type == "hidden") {
			getstr += obj.childNodes[i].name + "=" + obj.childNodes[i].value + "&";
			}
			if (obj.childNodes[i].type == "text") {
			getstr += obj.childNodes[i].name + "=" + obj.childNodes[i].value + "&";
			}
			if (obj.childNodes[i].type == "checkbox") {
			if (obj.childNodes[i].checked) {
			getstr += obj.childNodes[i].name + "=" + obj.childNodes[i].value + "&";
			} else {
			getstr += obj.childNodes[i].name + "=&";
			}
			}
			if (obj.childNodes[i].type == "radio") {
			if (obj.childNodes[i].checked) {
			getstr += obj.childNodes[i].name + "=" + obj.childNodes[i].value + "&";
			}
			}*/
			//         }   
			/*         if (obj.childNodes[i].tagName == "select") {
			var sel = obj.childNodes[i];
			getstr += sel.name + "=" + sel.options[sel.selectedIndex].value + "&";
			}   */
		}
		//alert('ajax.php?act='+act+getstr);
		makeRequest('ajax.php?act='+act,getstr);
	}

//var xmlHttp;
function getData2(act,id, xmlobj, request2,id2)
{ 
xmlobj=GetXmlHttpObject();
if (xmlobj==null)
  {
  alert ("Your browser does not support AJAX!");
  return;
  }

var url="ajax.php?act="+act;

xmlobj.onreadystatechange= function () {
	if (xmlobj.readyState==1)
	{
		document.getElementById(id).innerHTML="<img src='style_images/1/loader.gif' width='20' alt='Ä?ang tải dữ liệu'/>";
	}
	if (xmlobj.readyState==4)
	{
		document.getElementById(id).innerHTML=xmlobj.responseText;
		if(request2) {
			var xmlobj2;
			getData(request2,id2,xmlobj2);
		}
	}
}

xmlobj.open("GET",url,true);
xmlobj.send(null);
}

function getData(act,id, xmlobj)
{ 
xmlobj=GetXmlHttpObject();
if (xmlobj==null)
  {
  alert ("Your browser does not support AJAX!");
  return;
  }

var url="ajax.php?act="+act;

xmlobj.onreadystatechange= function () {
	if (xmlobj.readyState==1)
	{
		document.getElementById(id).innerHTML="<img src='style_images/1/loader.gif' width='20' alt='Ä?ang tải dữ liệu'/>";
	}
	if (xmlobj.readyState==4)
	{
		document.getElementById(id).innerHTML=xmlobj.responseText;
	}
}

xmlobj.open("GET",url,true);
xmlobj.send(null);
}

function GetXmlHttpObject()
{
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;
}