var _tpc_request = null;

try {
	_tpc_request = new XMLHttpRequest();
} catch (trymicrosoft) {
	try {
		_tpc_request = new ActiveXObject("Msxml2.XMLHTTP");		
	} catch (othermicrosoft) {
		try {
			_tpc_request = new ActiveXObject("Microsoft.XMLHTTP");
		} catch (failed) {
			_tpc_request = null;
		}
	}
}