var Import = {oRetStr:"", _createRequestInstance:function () 
{
	var _instance = null;
	if (window.XMLHttpRequest) 
	{		 
		_instance = new XMLHttpRequest();
		if (_instance.overrideMimeType) {
			_instance.overrideMimeType = "text/xml";
		}
	} else {
		if (window.ActiveXObject) {			
			var _msxml = ["Msxml2.XMLHTTP.6.0", "Msxml2.XMLHTTP.5.0", "Msxml2.XMLHTTP.4.0", "MSXML2.XMLHTTP.3.0", "MSXML2.XMLHTTP", "Microsoft.XMLHTTP"];
			for (var i = 0; i < _msxml.length; i++) {
				try {
					_instance = new ActiveXObject(_msxml[i]);
					break;
				}
				catch (e) {
				}
			}
		}
	}
	return _instance;
}, _exccute:function (file) {	
	var _instance = Import._createRequestInstance();
	if (_instance == null) 
	{
		alert("不支持ajax");
	} else {
		file = file + "?q=" + (new Date()).getTime();
		_instance.open("GET", file,false);
		_instance.send(null); 
			return _instance.responseText;
		};
	}
};