var xmlHttp = XMLHttpRequestObject();

function XMLHttpRequestObject()
{
 var xmlHttp;
 try
 {
  xmlHttp = new XMLHttpRequest();
 }
  catch(e)
  {
   var httpVerze = new Array;
   httpVerze = (
   'MSXML2.XMLHTTP.6.0',
   'MSXML2.XMLHTTP.5.0',
   'MSXML2.XMLHTTP.4.0',
   'MSXML2.XMLHTTP.3.0',
   'MXSML2.XMLHTTP',
   'Microsoft.XMLHTTP'
   );
   
   for(var i = 0; i < httpVerze && !xmlHttp; i++)
   {
    try
    {
     xmlHttp = new ActiveXObject(httpVerze[i]);
    }
     catch(e)
     {}
   }
  }
 if(xmlHttp) return xmlHttp;
 else alert("Mate nizsi verzi nez je Internet Explorer 7. Nektere veci nebudou spravne zobrazeny !!!");
}