/**
 * @author Administrator
 */
var xmlhttp=null;
function create()
{
	
	if(window.ActiveXObject)
	{
		try{
			xmlhttp=new ActiveXObject("Msxml2.XMLHTTP")
		}
		catch(e)
		{
			xmlhttp=new ActiveXObject("Microsoft.XMLHTTP")
		}	
	}
	else if(window.XMLHttpRequest)
	{
		xmlhttp=new XMLHttpRequest
		
	}
}
function open(meth,url,calback)
{
	create()
	xmlhttp.open(meth,url)
	xmlhttp.onreadystatechange=calback
	xmlhttp.send(null)
}

function loadXML(method,url,callback)
{
	create();
	xmlhttp.open(method,url);
	
	   xmlhttp.setRequestHeader("cache-control","no-cache"); 

     xmlhttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
	xmlhttp.onreadystatechange=function()
	{
		if(xmlhttp.readyState!=4)return;
		callback(xmlhttp);
	}
	xmlhttp.send(null);
}