var AJAX_REQUEST={DEBUG:false,DEFAULT_ASYNC:false,DEFAULT_METHOD:'POST',DEFAULT_URL:'rpcServer.php',MAX_REQUESTS:10,REQUEST_TIMEOUT:30000}
if(!window.ajax){window.ajax={NEXT_ID:0,COUNT:0,MAX_CONCURRENT:AJAX_REQUEST.MAX_REQUESTS};}
function AjaxRequest(method,url,async,requestTimeout,user,password){this.abort=function(){if(AJAX_REQUEST.DEBUG&&typeof(writeDebug)=='function')writeDebug('AjaxRequest.abort() called.');if(this.request&&this.busy){if(window.ajaxRequests&&window.ajaxTimers&&this.requestId>=0){if(AJAX_REQUEST.DEBUG&&typeof(writeDebug)=='function')writeDebug('abort(): clearing timeout: '+self.requestId+', timerId: '+window.ajaxTimers[self.requestId]);clearTimeout(window.ajaxTimers[this.requestId]);window.ajaxTimers[this.requestId]=null;window.ajaxRequests[this.requestId]=null;}
this.request.onreadystatechange=function(){};this.request.abort();this.request=null;this.busy=false;window.ajax.COUNT--;}}
this.send=function(){try{this.request=new ActiveXObject('Msxml2.XMLHTTP');}catch(e){try{this.request=new ActiveXObject('Microsoft.XMLHTTP');}catch(e){try{this.request=new XMLHttpRequest();}catch(e){this.request=null;}}}
if(this.request){var url=this.url;if(this.async&&this.callback){this.request.onreadystatechange=this.onStateChange;if(this.requestTimeout!=null&&this.timeout>0&&this.requestId==null){if(window.ajax.COUNT<window.ajax.MAX_CONCURRENT){this.requestId=window.ajax.NEXT_ID++;window.ajax.COUNT++;}else{alert('Too many concurrent ajax requests.');return false;}
if(AJAX_REQUEST.DEBUG&&typeof(writeDebug)=='function')writeDebug('XmlHttpRequest '+this.requestId+' setting timeout: '+this.requestTimeout);self.requestTimer=setTimeout(function(){self.abort();self.requestTimer=null;if(typeof(writeDebug)=='function')writeDebug('XmlHttpRequest '+self.requestId+' aborted.');},this.requestTimeout);}}
if(this.method=='POST'){this.request.open(this.method,this.url,this.async,this.user,this.password);this.request.setRequestHeader('Content-Type','application/x-www-form-urlencoded; charset=UTF-8');this.busy=true;this.request.send(this.params.join('&'));}else{url=this.url+(this.params.length>0?'?'+this.params.join('&'):'');this.request.open(this.method,url,this.async,this.user,this.password);this.busy=true;this.request.send('');}
if(!this.async){this.busy=false;;return this.request.responseXML;}}}
this.setParameter=function(name,value){if(AJAX_REQUEST.DEBUG&&typeof(writeDebug)=='function')writeDebug('AjaxRequest.setParameter('+name+', '+value+') called.');this.params.push(name+'='+encodeURIComponent(value));}
this.setResponseType=function(ResponseType){this.ResponseType=(ResponseType=='html'?'html':'xml');}
this.setCallback=function(func){if(typeof(func)=='function')this.callback=func;else alert('Unable to set callback handler. Must be a function.');}
this.onStateChange=function(){if(self.request&&self.request.readyState&&self.request.readyState==4){if(self.requestTimer&&self.requestId){if(AJAX_REQUEST.DEBUG&&typeof(writeDebug)=='function')writeDebug('XmlHttpRequest '+this.requestId+' clearing timeout.');clearTimeout(self.requestTimer);self.requestTimer=null;self.requestId=null;}
self.busy=false;if(AJAX_REQUEST.DEBUG&&typeof(writeDebug)=='function')writeDebug('XmlHttpRequest.reponseText: '+self.request.responseText);if(self.ResponseType&&self.ResponseType=='html'){self.callback(self.request.responseText);}else{self.callback(self.request.responseXML);}}}
this.method=method||AJAX_REQUEST.DEFAULT_METHOD;this.url=url||AJAX_REQUEST.DEFAULT_URL;this.async=async||AJAX_REQUEST.DEFAULT_ASYNC;this.requestTimeout=requestTimeout||AJAX_REQUEST.REQUEST_TIMEOUT;this.user=user||null;this.password=password||null;this.callback=null;this.params=new Array;this.request=null;this.requestTimer=null;this.ResponseType='xml';var self=this;}