var xmlHttp

function ShowAjax(str)
{ 
xmlHttp=GetXmlHttpObject()
if (xmlHttp==null)
{
alert ("Browser does not support HTTP Request")
return
} 
var url=str
xmlHttp.onreadystatechange=stateChanged
xmlHttp.open("GET",url,true)
xmlHttp.send(null)
}

function stateChanged() 
{ 
	document.getElementById("PlaceShow").innerHTML="<center><div class=DarkText><br><br><img src='images/loading.gif'> Vui lòng chờ, Hệ thống đang tải dữ liệu ...</div><center>";

	if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
	{ 
	document.getElementById("PlaceShow").innerHTML=xmlHttp.responseText 
	} 
} 

function GetXmlHttpObject()
{ 
var objXMLHttp=null
if (window.XMLHttpRequest)
{
objXMLHttp=new XMLHttpRequest()
}
else if (window.ActiveXObject)
{
objXMLHttp=new ActiveXObject("Microsoft.XMLHTTP")
}
return objXMLHttp
}