if ("undefined" == typeof (EFWS) || !EFWS) {
    var EFWS = {};
}

EFWS.Script = {
    loadScript: function(url, onload) {
        EFWS.Script.loadScriptDomElement(url, onload);
    },

    loadScripts: function(aUrls, onload) {
        // first pass: see if any of the scripts are on a different domain
        var nUrls = aUrls.length;
        var bDifferent = false;
        for (var i = 0; i < nUrls; i++) {
            if (EFWS.Script.differentDomain(aUrls[i])) {
                bDifferent = true;
                break;
            }
        }

        // pick the best loading function
        var loadFunc = EFWS.Script.loadScriptXhrInjection;
        if (bDifferent) {
            if (-1 != navigator.userAgent.indexOf('Firefox') ||
				 -1 != navigator.userAgent.indexOf('Opera')) {
                loadFunc = EFWS.Script.loadScriptDomElement;
            }
            else {
                loadFunc = EFWS.Script.loadScriptDocWrite;
            }
        }

        // second pass: load the scripts
        for (var i = 0; i < nUrls; i++) {
            loadFunc(aUrls[i], (i + 1 == nUrls ? onload : null), true);
        }
    },

    differentDomain: function(url) {
        if (0 === url.indexOf('http://') || 0 === url.indexOf('https://')) {
            var mainDomain = document.location.protocol +
				"://" + document.location.host + "/";
            return (0 !== url.indexOf(mainDomain));
        }

        return false;
    },

    loadScriptDomElement: function(url, onload) {
        var domscript = document.createElement('script');
        domscript.src = url;
        if (onload) {
            domscript.onloadDone = false;
            domscript.onload = function() {
                domscript.onloadDone = true;
                onload();
            };
            domscript.onreadystatechange = function() {
                if ("loaded" === domscript.readyState && !domscript.onloadDone) {
                    domscript.onloadDone = true;
                    domscript.onload();
                }
            }
        }
        document.getElementsByTagName('head')[0].appendChild(domscript);
    },

    loadScriptDocWrite: function(url, onload) {
        document.write('<scr' + 'ipt src="' + url +
					   '" type="text/javascript"></scr' + 'ipt>');
        if (onload) {
            // we can't tie it to the script's onload, so use window
            // thus, it doesn't fire as early as it might have
            EFWS.addHandler(window, "load", onload);
        }
    },

    queuedScripts: new Array(),

    loadScriptXhrInjection: function(url, onload, bOrder) {
        var iQueue = EFWS.Script.queuedScripts.length;
        if (bOrder) {
            var qScript = { response: null, onload: onload, done: false };
            EFWS.Script.queuedScripts[iQueue] = qScript;
        }

        var xhrObj = EFWS.Script.getXHRObject();
        xhrObj.onreadystatechange = function() {
            if (xhrObj.readyState == 4) {
                if (bOrder) {
                    EFWS.Script.queuedScripts[iQueue].response = xhrObj.responseText;
                    EFWS.Script.injectScripts();
                }
                else {
                    var se = document.createElement('script');
                    document.getElementsByTagName('head')[0].appendChild(se);
                    se.text = xhrObj.responseText;
                    if (onload) {
                        onload();
                    }
                }
            }
        };
        xhrObj.open('GET', url, true);
        xhrObj.send('');
    },

    injectScripts: function() {
        var len = EFWS.Script.queuedScripts.length;
        for (var i = 0; i < len; i++) {
            var qScript = EFWS.Script.queuedScripts[i];
            if (!qScript.done) {
                if (!qScript.response) {
                    // STOP! need to wait for this response
                    break;
                }
                else {
                    var se = document.createElement('script');
                    document.getElementsByTagName('head')[0].appendChild(se);
                    se.text = qScript.response;
                    if (qScript.onload) {
                        qScript.onload();
                    }
                    qScript.done = true;
                }
            }
        }
    },

    getXHRObject: function() {
        var xhrObj = false;
        try {
            xhrObj = new XMLHttpRequest();
        }
        catch (e) {
            var aTypes = ["Msxml2.XMLHTTP.6.0",
						  "Msxml2.XMLHTTP.3.0",
						  "Msxml2.XMLHTTP",
						  "Microsoft.XMLHTTP"];
            var len = aTypes.length;
            for (var i = 0; i < len; i++) {
                try {
                    xhrObj = new ActiveXObject(aTypes[i]);
                }
                catch (e) {
                    continue;
                }
                break;
            }
        }
        finally {
            return xhrObj;
        }
    }
};

EFWS.addHandler = function(elem, type, func) {
    if (elem.addEventListener) {
        elem.addEventListener(type, func, false);
    }
    else if (elem.attachEvent) {
        elem.attachEvent("on" + type, func);
    }
};