var xmlHttp;



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;

}

//-----------username check-----------

function Subscribeemail(str)

{

xmlHttp=GetXmlHttpObject()

if (xmlHttp==null)

{

alert ("Browser does not support HTTP Request")

return

} 

var url="addHotList.php"

url=url+"?username="+str

url=url+"&sid="+Math.random()

xmlHttp.onreadystatechange=userchk

xmlHttp.open("GET",url,true)

xmlHttp.send(null)

} 



function userchk() 

{ 

if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")

{ 

alert(xmlHttp.responseText)

}

}