Recreation of GM_ functions from GreaseMonkey for use with GreaseKit

Greasekit_Helper.js

//
// GreaseKit friendly
//

if(typeof GM_xmlhttpRequest === "undefined") {
	GM_xmlhttpRequest = function(/* object */ details) {
		details.method = details.method.toUpperCase() || "GET";
		
		if(!details.url) {
			throw("GM_xmlhttpRequest requires an URL.");
			return;
		}
		
		// build XMLHttpRequest object
		var oXhr, aAjaxes = [];
		if(typeof ActiveXObject !== "undefined") {
			var oCls = ActiveXObject;
			aAjaxes[aAjaxes.length] = {cls:oCls, arg:"Microsoft.XMLHTTP"};
			aAjaxes[aAjaxes.length] = {cls:oCls, arg:"Msxml2.XMLHTTP"};
			aAjaxes[aAjaxes.length] = {cls:oCls, arg:"Msxml2.XMLHTTP.3.0"};
		}
		if(typeof XMLHttpRequest !== "undefined")
			 aAjaxes[aAjaxes.length] = {cls:XMLHttpRequest, arg:undefined};
	
		for(var i=aAjaxes.length; i--; )
			try{
				oXhr = new aAjaxes[i].cls(aAjaxes[i].arg);
				if(oXhr) break;
			} catch(e) {}
		
		// run it
		if(oXhr) {
			if("onreadystatechange" in details)
				oXhr.onreadystatechange = function() { details.onreadystatechange(oXhr) };
			if("onload" in details)
				oXhr.onload = function() { details.onload(oXhr) };
			if("onerror" in details)
				oXhr.onerror = function() { details.onerror(oXhr) };
			
			oXhr.open(details.method, details.url, true);
			
			if("headers" in details)
				for(var header in details.headers)
					oXhr.setRequestHeader(header, details.headers[header]);
			
			if("data" in details)
				oXhr.send(details.data);
			else
				oXhr.send();
		} else
			throw ("This Browser is not supported, please upgrade.")
	}
}

if(typeof GM_addStyle === "undefined") {
	function GM_addStyle(/* String */ styles) {
		var oStyle = document.createElement("style");
		oStyle.setAttribute("type", "text\/css");
		oStyle.appendChild(document.createTextNode(styles));
		document.getElementsByTagName("head")[0].appendChild(oStyle);
	}
}

if(typeof GM_log === "undefined") {
	function GM_log(log) {
		if(console)
			console.log(log);
		else
			alert(log);
	}
}