/* Simple AJAX Code-Kit (SACK) v1.6.1 */
/* 2005 Gregory Wild-Smith */
/* www.twilightuniverse.com */
/* Software licenced under a modified X11 licence,
   see documentation or authors website for more details */
var ff = "";

function sack(file) {
    this.xmlhttp = null;

    this.resetData = function() {
        this.method = "POST";
        this.queryStringSeparator = "?";
        this.argumentSeparator = "&";
        this.URLString = "";
        this.encodeURIString = true;
        this.execute = false;
        this.element = null;
        this.elementObj = null;
        this.requestFile = file;
        this.vars = new Object();
        this.responseStatus = new Array(2);
    };

    this.resetFunctions = function() {
        this.onLoading = function() { };
        this.onLoaded = function() { };
        this.onInteractive = function() { };
        this.onCompletion = function() { };
        this.onError = function() { };
        this.onFail = function() { };
    };

    this.reset = function() {
        this.resetFunctions();
        this.resetData();
    };

    this.createAJAX = function() {

        ff = "";

        try {
            this.xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
        } catch (e1) {
            try {
                this.xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e2) {
                this.xmlhttp = null;
            }
        }

        if (!this.xmlhttp) {
            if (typeof XMLHttpRequest != "undefined") {
                this.xmlhttp = new XMLHttpRequest();
                ff = "ff";
            } else {
                this.failed = true;
            }
        }
    };

    this.setVar = function(name, value) {
        this.vars[name] = Array(value, false);
    };

    this.encVar = function(name, value, returnvars) {
        if (true == returnvars) {
            return Array(encodeURIComponent(name), encodeURIComponent(value));
        } else {
            this.vars[encodeURIComponent(name)] = Array(encodeURIComponent(value), true);
        }
    }

    this.processURLString = function(string, encode) {
        encoded = encodeURIComponent(this.argumentSeparator);
        regexp = new RegExp(this.argumentSeparator + "|" + encoded);
        varArray = string.split(regexp);
        for (i = 0; i < varArray.length; i++) {
            urlVars = varArray[i].split("=");
            if (true == encode) {
                this.encVar(urlVars[0], urlVars[1]);
            } else {
                this.setVar(urlVars[0], urlVars[1]);
            }
        }
    }

    this.createURLString = function(urlstring) {
        if (this.encodeURIString && this.URLString.length) {
            this.processURLString(this.URLString, true);
        }

        if (urlstring) {
            if (this.URLString.length) {
                this.URLString += this.argumentSeparator + urlstring;
            } else {
                this.URLString = urlstring;
            }
        }

        // prevents caching of URLString
        this.setVar("rndval", new Date().getTime());

        urlstringtemp = new Array();
        for (key in this.vars) {
            if (false == this.vars[key][1] && true == this.encodeURIString) {
                encoded = this.encVar(key, this.vars[key][0], true);
                delete this.vars[key];
                this.vars[encoded[0]] = Array(encoded[1], true);
                key = encoded[0];
            }

            urlstringtemp[urlstringtemp.length] = key + "=" + this.vars[key][0];
        }
        if (urlstring) {
            this.URLString += this.argumentSeparator + urlstringtemp.join(this.argumentSeparator);
        } else {
            this.URLString += urlstringtemp.join(this.argumentSeparator);
        }
    }

    this.runResponse = function() {
        eval(this.response);
    }

    this.runAJAX = function(urlstring) {

        var params = urlstring;
        if (this.failed) {
            this.onFail();
        } else {
            this.createURLString(urlstring);
            if (this.element) {
                this.elementObj = document.getElementById(this.element);
            }

            if (this.xmlhttp) {
                var self = this;

                this.xmlhttp.open(this.method, this.requestFile, false);
                try {
                    this.xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded")
                    this.xmlhttp.setRequestHeader("Content-length", params.length)
                } catch (e) { }


                if (ff == "ff") {
                   
                    this.xmlhttp.onload = this.xmlhttp.onerror = this.xmlhttp.onabort = function() {
                        switch (self.xmlhttp.readyState) {
                            case 1:
                                self.onLoading();
                                break;
                            case 2:
                                self.onLoaded();
                                break;
                            case 3:
                                self.onInteractive();
                                break;
                            case 4:
                                self.response = self.xmlhttp.responseText;
                                self.responseXML = self.xmlhttp.responseXML;
                                self.responseStatus[0] = self.xmlhttp.status;
                                self.responseStatus[1] = self.xmlhttp.statusText;

                                if (self.execute) {
                                    self.runResponse();
                                }

                                if (self.elementObj) {
                                    elemNodeName = self.elementObj.nodeName;
                                    elemNodeName.toLowerCase();
                                    if (elemNodeName == "input"
                								|| elemNodeName == "select"
                								|| elemNodeName == "option"
                								|| elemNodeName == "textarea") {
                                        self.elementObj.value = self.response;
                                    } else {
                                        self.elementObj.innerHTML = self.response;

                                    }
                                }
                                if (self.responseStatus[0] == "200") {
                                    self.onCompletion();
                                } else {
                                    self.onError();
                                }

                                self.URLString = "";
                                break;
                        }
                    }
                }
                else {


                    this.xmlhttp.onreadystatechange = function() {

                        switch (self.xmlhttp.readyState) {
                            case 1:
                                self.onLoading();
                                break;
                            case 2:
                                self.onLoaded();
                                break;
                            case 3:
                                self.onInteractive();
                                break;
                            case 4:
                                self.response = self.xmlhttp.responseText;
                                self.responseXML = self.xmlhttp.responseXML;
                                self.responseStatus[0] = self.xmlhttp.status;
                                self.responseStatus[1] = self.xmlhttp.statusText;

                                if (self.execute) {
                                    self.runResponse();
                                }

                                if (self.elementObj) {
                                    elemNodeName = self.elementObj.nodeName;
                                    elemNodeName.toLowerCase();
                                    if (elemNodeName == "input"
								|| elemNodeName == "select"
								|| elemNodeName == "option"
								|| elemNodeName == "textarea") {
                                        self.elementObj.value = self.response;
                                    } else {
                                        self.elementObj.innerHTML = self.response;

                                    }
                                }
                                if (self.responseStatus[0] == "200") {
                                    self.onCompletion();
                                } else {
                                    self.onError();
                                }

                                self.URLString = "";
                                break;
                        }
                    };

                }

                this.xmlhttp.send(params);


            }
        }
    };

    this.reset();
    this.createAJAX();
}