var xmlHttp
<!----------dang ky------------------------------------------------------------------->
function dangky(file)
{ 
var url=""+file+"";
xmlHttp=GetXmlHttpObject(statehome)
xmlHttp.open("GET", url , true)
xmlHttp.send(null)
} 

function statehome() 
{ 
if (xmlHttp.readyState==1 || xmlHttp.readyState==2)
{ 
document.getElementById("dangky").innerHTML='<img src=images/loading.gif boder=0 >';

} 

  else  if (xmlHttp.readyState==4 || xmlHttp.readyState=="200")
{ 
document.getElementById("dangky").innerHTML=xmlHttp.responseText 
window.status="Ðã tải xong dữ liệu !";
}  
}

<!----------nlty------------------------------------------------------------------->

<!----------Search------------------------------------------------------------------->
function showCustomer(file)
{ 
var url=""+file+"";
xmlHttp=GetXmlHttpObject(stateChanged)
xmlHttp.open("GET", url , true)
xmlHttp.send(null)
} 

function stateChanged() 
{ 
if (xmlHttp.readyState==1 || xmlHttp.readyState==2)
{ 
document.getElementById("timkiem").innerHTML='<center><div style=width: 360><center>NLTY Music Love <br><br><img src=images/loading.gif boder=0 ><br><br>Ðang tải dữ liệu ...</center>';

} 

  else  if (xmlHttp.readyState==4 || xmlHttp.readyState=="200")
{ 
document.getElementById("timkiem").innerHTML=xmlHttp.responseText 
window.status="Ðã tải xong dữ liệu !";
}  
}
<!----------search------------------------------------------------------------------->
<!----------showmusic------------------------------------------------------------------->
function showmusic(file)
{ 
var url=""+file+"";
xmlHttp=GetXmlHttpObject(stateChangedmusic)
xmlHttp.open("GET", url , true)
xmlHttp.send(null)
} 

function stateChangedmusic() 
{ 
if (xmlHttp.readyState==1 || xmlHttp.readyState==2)
{ 
document.getElementById("showmusic").innerHTML='<center><div style=width: 360><center>NLTY Music Love <br><br><img src=images/loading.gif boder=0 ><br><br>Ðang tải dữ liệu ...</center>';

} 

  else  if (xmlHttp.readyState==4 || xmlHttp.readyState=="200")
{ 
document.getElementById("showmusic").innerHTML=xmlHttp.responseText 
window.status="Ðã tải xong dữ liệu !";
}  
}
<!----------showmusic------------------------------------------------------------------->
<!----------play------------------------------------------------------------------->
function showplay(file)
{ 
var url=""+file+"";
xmlHttp=GetXmlHttpObject(stateplay)
xmlHttp.open("GET", url , true)
xmlHttp.send(null)
} 

function stateplay() 
{ 
if (xmlHttp.readyState==1 || xmlHttp.readyState==2)
{ 
document.getElementById("play").innerHTML='<center><div style=width: 360><center><br><br>NLTY Music Love <br><br><img src=images/loading_play.gif boder=0 ><br><br>Ðang tải dữ liệu ...</center>';

} 

  else  if (xmlHttp.readyState==4 || xmlHttp.readyState=="200")
{ 
document.getElementById("play").innerHTML=xmlHttp.responseText 
window.status="Ðã tải xong dữ liệu !";
}  
}

<!----------play------------------------------------------------------------------->












<!----------------------------------------------------------------------------->
function GetXmlHttpObject(handler)
{ 
var objXmlHttp=null

if (navigator.userAgent.indexOf("Opera")>=0)
{
alert("This example doesn't work in Opera") 
return 
}
if (navigator.userAgent.indexOf("MSIE")>=0)
{ 
var strName="Msxml2.XMLHTTP"
if (navigator.appVersion.indexOf("MSIE 5.5")>=0)
{
strName="Microsoft.XMLHTTP"
} 
try
{ 
objXmlHttp=new ActiveXObject(strName)
objXmlHttp.onreadystatechange=handler 
return objXmlHttp
} 
catch(e)
{ 
alert("Error. Scripting for ActiveX might be disabled") 
return 
} 
} 
if (navigator.userAgent.indexOf("Mozilla")>=0)
{
objXmlHttp=new XMLHttpRequest()
objXmlHttp.onload=handler
objXmlHttp.onerror=handler 
return objXmlHttp
}
}