function ajax_send(url,onfinish)
{
	var request=new httprequest();
	request.onfinish=function(){eval(onfinish);}
	request.onerror=function(e){alert(e.message);}
	request.open("get",url+"&math="+math.random(),true);
	request.setrequestheader('content-type','text/xml');
	request.setrequestheader("charset","utf-8");
	request.send(null);
}

function httprequest()
{
	if(this==window)throw new error(0,"httprequest is unable to call as a function.")
	var me=this;
   	var asyncflag=false;
   	var typeflag=false;
	var r;
	function onreadystatechange()
	{
		if(me.onreadystatechange)me.onreadystatechange.call(r);
		if(r.readystate==4)
		{
			if(number(r.status)>=300)
			{
				if(me.onerror)me.onerror.call(r,new error(0,"http error:"+r.status+" "+r.statustext));
				if(typeflag)r.onreadystatechange=function.prototype;
				else r.onreadystatechange=function.prototype;
				r=null;
				return;
			}
			me.status=r.status;
			me.statustext=r.statustext;
			me.responsetext=r.responsetext;
			me.responsebody=r.responsebody;
			me.responsexml=r.responsexml;
			me.readystate=r.readystate;
			if(typeflag)r.onreadystatechange=function.prototype;
			else r.onreadystatechange=function.prototype;
			r=null;
			if(me.onfinish)me.onfinish();
		}
	}
	function creathttprequest(){
		var e;
		try{
			r=new window.xmlhttprequest();
			typeflag=true;
		} catch(e) {			
			var activexname=[
				'msxml2.xmlhttp.6.0',
				'msxml2.xmlhttp.3.0',
				'msxml2.xmlhttp.5.0',
				'msxml2.xmlhttp.4.0',
				'msxml2.xmlhttp',
				'msxml.xmlhttp',
				'microsoft.xmlhttp'
			]
			function xmlhttpactivex()
			{
				var e;
				for(var i=0;i<activexname.length;i++)
				{
					try{
						var ret=new activexobject(activexname[i]);
						typeflag=false;
					} catch(e) {
						continue;
					}
					return ret;
				}
				throw {"message":"xmlhttp activex unsurported."};
			}
			try{
				r=new xmlhttpactivex();
				typeflag=false;
			} catch(e) {
				throw new error(0,"xmlhttprequest unsurported.");
			}
		}
	}
	creathttprequest();


	this.abort=function(){
		r.abort();
	}
	this.getallresponseheaders=function(){
		r.getallresponseheaders();
	}
	this.getresponseheader=function(header){
		r.getresponseheader(bstrheader);
	}
	this.open=function(method,url,async,user,password){
		asyncflag=async;
		try{
			r.open(method,url,async,user,password);
		} catch(e) {
			if(me.onerror)me.onerror(e);
			else throw e;
		}
	}
	this.send=function(body){
		try{
			if(typeflag)r.onreadystatechange=onreadystatechange;
			else r.onreadystatechange=onreadystatechange;

			r.send(body);
			//alert("sended");
			if(!asyncflag){
				this.status=r.status;
				this.statustext=r.statustext;
				this.responsetext=r.responsetext;
				this.responsebody=r.responsebody;
				this.responsexml=r.responsexml;
				this.readystate=r.readystate;

				if(typeflag)r.onreadystatechange=function.prototype;
				else r.onreadystatechange=function.prototype;

				r=null;
			}
		} catch(e) {
			if(me.onerror)me.onerror(e);
			else throw e;
		}
		//alert("sended");
	}
	this.setrequestheader=function(name,value){
		r.setrequestheader(name,value);
	}
}