function switchClass(obj, strClassName) {
	obj.className = strClassName;
}

/*@cc_on @if (@_win32 && @_jscript_version >= 5) if (!window.XMLHttpRequest)
if (!XMLHttpRequest) {
    function XMLHttpRequest() { return new ActiveXObject('Microsoft.XMLHTTP') }
}
@end @*/

function xml_request(url, callback) {
	var http_request = new XMLHttpRequest();

	if(!http_request) return;
	http_request.open('GET', url, true);
	http_request.onreadystatechange = function() {
		if(http_request.readyState == 4) {
			callback(http_request);
		}
	}
	http_request.send(null);
}