function getXmlHttpObject()
{
    var _http=null;
    try
    {
      // Firefox, Opera 8.0+, Safari
      _http=new XMLHttpRequest();
    }
    catch (e)
    {
      // Internet Explorer
      try
      {
		 _http=new ActiveXObject("Microsoft.XMLHTTP");
         
      }
      catch (e)
      {
        _http=new ActiveXObject("Msxml2.XMLHTTP");
      }
    }
    if(_http==null){
        alert("Ajax is Not Supported");
    }
    return _http;
}