var xmlhttp;
function getxmlhttpobject()
    {
        var xmlhttp=null;
        try{
            //dành cho trình duyệt  Firefox, Opera 8.0+, Safari
            xmlhttp = new XMLHttpRequest();
            }    
            catch(e){
                try{
                    //dành cho trình duyệt internet explore
                    xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
                    }
                    catch(e){                        
                            xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");                            
                        }
                }
                return xmlhttp;
        }
function stateChanged()
    {
        if(xmlhttp.readyState==3)        
            {
                document.getElementById('show_tour').innerHTML='Loading...';
                }
        if(xmlhttp.readyState==4)        
            {
                document.getElementById('show_tour').innerHTML=xmlhttp.responseText;
                }
        }
function getFile(getFolder,getURL,getURLID,getID)
    {
        xmlhttp=getxmlhttpobject();
        if(xmlhttp==null)
            {
                alert("Not support Ajax!");
                return false;
                }
        var url="system/"+getFolder+"/"+getURL+".php?"+getURLID+"="+getID+"&action="+getURL;//khai báo trang checkuser.php
        //url=url+"?tourid="+id;
       	//url=url+"&sid="+Math.random();
        xmlhttp.onreadystatechange=stateChanged;
        xmlhttp.open("POST",url,true);
        xmlhttp.send(null);//gửi dữ liệu đến trang checkuser.php
    }