var ajax = {
	asyncRequest : function() {
			function handleReadyState(o, callback) {
				if (o && o.readyState == 4 && o.status == 200) {
					if (callback) {
						if (typeof(callback) == 'function') {
							callback(o);
						}
						if (typeof(callback) == 'object') {
							for (var i = 0; i < callback.length; i++) {
								try {
									callback[i](o);
								}
								catch(e) {
								}							
							}
						}					
					}	
		    }
		  }
			var getXHR = function() {
				var http;
				try {
					http = new XMLHttpRequest;
					getXHR = function() {
						return new XMLHttpRequest;
					};
				}
				catch(e) {
					var msxml = [
						'MSXML2.XMLHTTP.3.0',
			        	'MSXML2.XMLHTTP',
			        	'Microsoft.XMLHTTP'
			     	];
					for (var i = 0, len = msxml.length; i < len; ++i) {
						try {
							http = new ActiveXObject(msxml[i]);
							getXHR = function() {
								return new ActiveXObject(msxml[i]);
							};
							break;
						}
				    catch(e) {
						}
					}
				}
				return http;
			};
			return function(method, uri, callback, postData) {
			  var http = getXHR();
				http.open(method, uri, true);
				http.onreadystatechange = function() { handleReadyState(http, callback); };
				http.send(postData || null);
				return http;
			};
	}()
}