// jXHR.js (JSON-P XHR)
 // v0.1 (c) Kyle Simpson
 // MIT License
 
 (function(global){
 	var SETTIMEOUT = global.setTimeout, // for better compression
 		doc = global.document,
 		callback_counter = 0;
 
 	global.jXHR = function() {
 		var script_url,
 			script_loaded,
 			jsonp_callback,
 			scriptElem,
 			publicAPI = null;
 
 		function removeScript() { try { scriptElem.parentNode.removeChild(scriptElem); } catch (err) { } }
 
 		function reset() {
 			script_loaded = false;
 			script_url = "";
 			removeScript();
 			scriptElem = null;
 			fireReadyStateChange(0);
 		}
 
 		function ThrowError(msg) {
 			try { publicAPI.onerror.call(publicAPI,msg,script_url); } catch (err) { throw new Error(msg); }
 		}
 
 		function handleScriptLoad() {
 			if ((this.readyState && this.readyState!=="complete" && this.readyState!=="loaded") || script_loaded) { return; }
 			this.onload = this.onreadystatechange = null; // prevent memory leak
 			script_loaded = true;
 			if (publicAPI.readyState !== 4) ThrowError("Script failed to load ["+script_url+"].");
 			removeScript();
 		}
 
 		function fireReadyStateChange(rs,args) {
 			args = args || [];
 			publicAPI.readyState = rs;
 			if (typeof publicAPI.onreadystatechange === "function") publicAPI.onreadystatechange.apply(publicAPI,args);
 		}
 
 		publicAPI = {
 			onerror:null,
 			onreadystatechange:null,
 			readyState:0,
 			open:function(method,url){
 				reset();
 				internal_callback = "cb"+(callback_counter++);
 				(function(icb){
 					global.jXHR[icb] = function() {
 						try { fireReadyStateChange.call(publicAPI,4,arguments); }
 						catch(err) {
 							publicAPI.readyState = -1;
 							ThrowError("Script failed to run ["+script_url+"].");
 						}
 						global.jXHR[icb] = null;
 					};
 				})(internal_callback);
 				script_url = url.replace(/=\?/,"=jXHR."+internal_callback);
 				fireReadyStateChange(1);
 			},
 			send:function(){
 				SETTIMEOUT(function(){
 					scriptElem = doc.createElement("script");
 					scriptElem.setAttribute("type","text/javascript");
 					scriptElem.onload = scriptElem.onreadystatechange = function(){handleScriptLoad.call(scriptElem);};
 					scriptElem.setAttribute("src",script_url);
 					doc.getElementsByTagName("head")[0].appendChild(scriptElem);
 				},0);
 				fireReadyStateChange(2);
 			},
 			setRequestHeader:function(){}, // noop
 			getResponseHeader:function(){return "";}, // basically noop
 			getAllResponseHeaders:function(){return [];} // ditto
 		};
 
 		reset();
 
 		return publicAPI;
 	};
 })(window);