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;
}