function createXHR() 
{
    var request = false;
        try {
            request = new ActiveXObject('Msxml2.XMLHTTP');

        }
        catch (err2) {
            try {
                request = new ActiveXObject('Microsoft.XMLHTTP');

            }
            catch (err3) {
		try {
            request = new XMLHttpRequest();
		}
		catch (err1)
		{
			request = false;
		}
            }
        }

    return request;
}