var JSON={
	fn: {} // callbacks
	,req: function(url,callback){
		var cb=JSON.temp_fn(callback);
		url=url.replace(/%cb/g,cb);
		var sc=document.createElement("script");
		sc.src=url;
		sc.addEventListener("load",function(e){
			document.body.removeChild(this);
			window[cb]=null;
		},false);
		document.body.appendChild(sc);
		var ret=next(function(){
			if(!!window[cb]) return next(arguments.callee);
			return ;
		}).next(function(){
			var ret=JSON.fn[cb].arg;
			JSON.fn[cb]=null;
			delete JSON.fn[cb];
			return ret;
		});
		return ret;
	}

	,temp_fn: function(fn){
		do {
			var name="jsonp_"+(""+Math.random()).replace(/[^0-9]/g,"");
		} while(typeof window[name] != "undefined");
		var args=arguments;
		JSON.fn[name]={fn: fn};
		window[name]=function(json){
			JSON.fn[name]["arg"]=JSON.fn[name].fn(json);
		}
		return name;
	}
}