function createXHR() 
{
    var request = false;
        try {
            request = new XMLHttpRequest();
        }
        catch (err2) {
            try {
                request = new ActiveXObject('Microsoft.XMLHTTP');
            }
            catch (err3) {
				try {
					request = new ActiveXObject('Msxml2.XMLHTTP');
				}
				catch (err1) 
				{
					request = false;
				}
            }
        }
    return request;
}