function rewinajax()
{
	var self = null;
	var begin_call_time;
	var end_call_time;
    var returnedStr;
	self = this;
	var disarea=null;
	self.onloading = function(http_request) {
	  if(this.disarea!=null){
	   this.disarea.style.visibility="visible";
	   //this.disarea.innerHTML="  正在加载中....";
	  }
     
	};
	self.onloaded = function(http_request) {
		if(this.disarea!=null){
		   this.disarea.style.visibility="visible";
	      //this.disarea.innerHTML="  加载完毕....";
	     }
	};
	self.oninteractive = function(http_request) {
	 if(this.disarea!=null){
        this.disarea.style.visibility="visible";
	    //this.disarea.innerHTML="  准备显示....";
	 }
	 //this.disarea.style.display="none";
	};
	self.oncomplete = function(http_request) {	 
	 if(this.disarea!=null){     
		this.disarea.style.visibility="hidden";
	    //this.disarea.innerHTML="交互完成";
	  }
	};
    this.returnedStr="";

	//Get the XMLHttpRequest Object
	this.getRequestObject = function()
	{
		//if (rewinajaxDebug) this.DebugMessage("Initializing Request Object..");
		var req;
		                //开始初始化XMLHttpRequest对象
       if(window.XMLHttpRequest) { //Mozilla 浏览器
          req = new XMLHttpRequest();
          if (req.overrideMimeType) {//设置MiME类别
               req.overrideMimeType('text/xml');
           }
        }
        else if (window.ActiveXObject) { // IE浏览器
           try {
             req = new ActiveXObject("Msxml2.XMLHTTP");
            } catch (e) {
                  try {
                         req = new ActiveXObject("Microsoft.XMLHTTP");
                      } catch (e) {}
            }
        }
        
		if(!req && typeof XMLHttpRequest != "undefined")
			req = new XMLHttpRequest();

        //if (rewinajaxDebug) {
			//	if (!req) this.DebugMessage("Request Object Instantiation failed.");
		//}
        return req;		
		
	}

this.call = function(url, oncompleteHandler) {
			begin_call_time = new Date();
			var http_request = this.getRequestObject();
			http_request.open("POST", url, false);
			http_request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
			http_request.setRequestHeader("charset","utf-8");
			http_request.onreadystatechange = function (){
			    switch(http_request.readyState) {
			    case 1:
			    	if (typeof self.onloading == "function") {
			        	self.onloading(http_request);
			        }
			        break;
			    case 2:
			    	if (typeof self.onloaded == "function") {
			        	self.onloaded(http_request);
			        }
			        break;
			    case 3:
			    	if (typeof self.oninteractive == "function") {
			        	self.oninteractive(http_request);
			        }
			        break;
			    case 4:
			    	end_call_time = new Date();
			    	if (typeof self.oncomplete == "function") {
			        	self.oncomplete(http_request);
			        }
			    	if (typeof oncompleteHandler == "function") {
			    		oncompleteHandler(http_request);
			    	}
			    	
			        break;
			    }
			};
			// 确定发送请求的方式和URL以及是否同步执行下段代码
			http_request.send(null);
}

function setResStr (req){
  self.returnedStr = req.responseText;
}

this.send_request = function(url) {
	 self.call(url,setResStr);
}
this.setDisdiv=function(divobj){
     this.disarea=divobj;
}
this.askForData = function(url,func0){
   self.call(url,setResStr);   
  if (typeof func0 == "function") {
	func0(this.returnedStr);

  }

}

}

var rewinajax = new rewinajax();