var browser = "";

function getHttpXmlRequstObj()
{
    var xmlHttp = null;
    try
    {
    // Firefox, Opera 8.0+, Safari
    xmlHttp=new XMLHttpRequest();
    browser = "other";
    }
  catch (e)
    {
    // Internet Explorer
    try
      {
      xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
      browser = "ie";
      }
    catch (e)
      {
        xmlHttp=new ActiveXObject("Microsoft.XMLHTTP"); 
        browser = "ie";
      }
    }
    return xmlHttp;
}