function XmlHttp(){
    var request=new XMLHttpRequest();
    if(!Global.ie)request.overrideMimeType('text/xml');
	EventDispatcher.initialize(this);
    this.open=function Open(url,method){
		if(method==null) method="POST";
		request.open(method,encodeURI(url), true);
		request.setRequestHeader("Content-Type","application/x-www-form-urlencoded;charset=GB2312");
	}
	
	
    this.send=function send(value){
		if(request==null) value='';
		request.send(value);
		var target=this;
		request.onreadystatechange=function(){
			if(request.readyState==4){
				if (request.status == 200){
					var text=request.responseText;
					if(Global.ie){
							xml = new ActiveXObject("Microsoft.XMLDOM");
							xml.async = false;
							xml.loadXML(text);
							
					}else xml=request.responseXML;
					
					target.dispatchEvent({type:"onLoad",text:text,xml:xml});
				}
			}
		}
	}
}