var xmlhttp=false;

/*@cc_on @*/
/*@if (@_jscript_version >= 5)
// JScript gives us Conditional compilation, we can cope with old IE versions.
// and security blocked creation of the objects.

try
{
    xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
}
catch (e)
{
    try
    {
        xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
    }
    catch (E)
    {
        xmlhttp = false;
    }
}

@end @*/

if (!xmlhttp && typeof XMLHttpRequest!='undefined')
{
  xmlhttp = new XMLHttpRequest();
}