// JScript File
//
// Public Functions within this file:
//
// ---------- Cookie Functions ----------
//
// GetCookie(cookiename)                : Returns String or ''
// SetCookie(cookiename, value, [expiration], [path], [domain], [secure])
// DeleteCookie(cookiename)
//
// ---------- AJAX Style Calls ----------
//
// exec(javascripttext)                 : Returns Evaluation of Code
// HTTPPost(url, params, callback)
// HTTPGet(url, params, callback)
// AJAX Class:
//      AJAX.Post(url, params, callback)
//      AJAX.Get(url, params, callback)
// callback = func(sResponseText)
//
// ---------- Base 64 Encoding ----------
//
// Base64.encode(text)                  : Returns String
// Base64.decode(text)                  : Returns String
// GetObjectByID( id )                  : Returns Object
//
var sharedAJAX = null;
var cachedJavascript;

function HTTPPost(url, params, callback) {
    if (sharedAJAX == null) {
        sharedAJAX = new AJAX;
    }
    
    sharedAJAX.Post(url, params, callback);
}

function HTTPGet(url, params, callback)  {
    if (sharedAJAX == null) {
        sharedAJAX = new AJAX;
    }

    sharedAJAX.Get(url, params, callback);    
}

function exec(code) {
    try {
        eval(cachedJavascript);
        return eval(code);
    } catch(err) {
        alert("Failure in call: " + err.description + "\r\n")
    }
}

function SetCookie ( name, value, expires, path, domain, secure )
{
    var cookie_string = name + "=" + escape ( value );

    if ( expires )
    {
        var exp_parts = expires.split("/");
        var exp_y = exp_parts[2];
        var exp_m = exp_parts[0] - 1;
        var exp_d = exp_parts[1];
        
        var expires_date = new Date ( exp_y, exp_m, exp_d );
        cookie_string += "; expires=" + expires_date.toGMTString();
    }

    if ( path   )   cookie_string += "; path=" + escape ( path );
    if ( domain )   cookie_string += "; domain=" + escape ( domain );
    if ( secure )   cookie_string += "; secure";

    document.cookie = cookie_string;
}

function DeleteCookie ( cookie_name )
{
    SetCookie( cookie_name, '' );
    var cookie_date = new Date ( );  // current date & time
    cookie_date.setTime ( cookie_date.getTime() - 1 );
    document.cookie = cookie_name += "=; expires=" + cookie_date.toGMTString();
}

function GetCookie ( cookie_name )
{
    var results = document.cookie.match ( '(^|;) ?' + cookie_name + '=([^;]*)(;|$)' );

    if ( results )
        return ( unescape ( results[2] ) );
    else
        return '';
}

function AJAX() {
    var self = this;
    var AJAXInitialized;
    var xmlHttp;
    var ServerResponse;
    
    var init = function () {
        if(self.AJAXInitialized==true)
        {   return true;
        }
        
        try
        {
            // Firefox, Opera 8.0+, Safari
            xmlHttp=new XMLHttpRequest();
            AJAXInitialized=true;
            return true;
        }
        catch (e)
        {
            // Internet Explorer
            try
            {
                xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
                AJAXInitialized=true;
                return true;
            }
            catch (e)
            {
                try
                {
                    xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
                    AJAXInitialized=true;
                    return true;
                }
                catch (e)
                {
                    alert("Your browser does not support AJAX!");
                    return false;
                }
            }
        }
    }

    var HandleStateChanges = function () {
        if (xmlHttp.readyState==4)
        {
            try {
                //if any <SCRIPT> tags are found, enable the first one
                var sText = xmlHttp.responseText;
                
                var iTagStart = sText.indexOf("<script");
                if (iTagStart > -1)
                {   // <script found - get the text
                    var iTagEnd = sText.indexOf(">",iTagStart);
                    var iScriptEnd = sText.indexOf("</script",iTagStart);
                    
                    cachedJavascript = sText.substring(iTagEnd+1,iScriptEnd-1);
                }
                
                iTagStart = sText.indexOf("ERROR: ");
                if (iTagStart == 0)
                {
                    alert(sText);
                }
            } catch(err) {
                sText = err.description;
            }
            
            ServerResponse(sText);
        }
    }

    this.Post = function (url, params, callback) {
        if (init()==true)
        {
            xmlHttp.open("POST", url, true);
            
            //Send the proper header information along with the request
            xmlHttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
            xmlHttp.setRequestHeader("Content-length", params.length);
            xmlHttp.setRequestHeader("Connection", "close");
            
            ServerResponse = callback;
            xmlHttp.onreadystatechange = HandleStateChanges;
            
            xmlHttp.send(params);
        }
    }

    this.Get = function (url, params, callback) {
        if (init()==true)
        {        
            xmlHttp.open("GET", url + "?" + params, true);
            
            ServerResponse = callback;
            xmlHttp.onreadystatechange = HandleStateChanges;
            
            xmlHttp.send(null);
        }
    }
}

function GetObjectByID( id )
{
    if (document.getElementById)
        var returnVar = document.getElementById(id);
    else if (document.all)
        var returnVar = document.all[id];
    else if (document.layers)
        var returnVar = document.layers[id];
    return returnVar;
}

/**
*
*  Base64 encode / decode
*  http://www.webtoolkit.info/
*
**/

var Base64 = {

    // private property
    _keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",

    // public method for encoding
    encode : function (input) {
        var output = "";
        var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
        var i = 0;

        input = Base64._utf8_encode(input);

        while (i < input.length) {

            chr1 = input.charCodeAt(i++);
            chr2 = input.charCodeAt(i++);
            chr3 = input.charCodeAt(i++);

            enc1 = chr1 >> 2;
            enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
            enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
            enc4 = chr3 & 63;

            if (isNaN(chr2)) {
                enc3 = enc4 = 64;
            } else if (isNaN(chr3)) {
                enc4 = 64;
            }

            output = output +
            this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) +
            this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);

        }

        return output;
    },

    // public method for decoding
    decode : function (input) {
        var output = "";
        var chr1, chr2, chr3;
        var enc1, enc2, enc3, enc4;
        var i = 0;

        input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

        while (i < input.length) {

            enc1 = this._keyStr.indexOf(input.charAt(i++));
            enc2 = this._keyStr.indexOf(input.charAt(i++));
            enc3 = this._keyStr.indexOf(input.charAt(i++));
            enc4 = this._keyStr.indexOf(input.charAt(i++));

            chr1 = (enc1 << 2) | (enc2 >> 4);
            chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
            chr3 = ((enc3 & 3) << 6) | enc4;

            output = output + String.fromCharCode(chr1);

            if (enc3 != 64) {
                output = output + String.fromCharCode(chr2);
            }
            if (enc4 != 64) {
                output = output + String.fromCharCode(chr3);
            }

        }

        output = Base64._utf8_decode(output);

        return output;

    },

    // private method for UTF-8 encoding
    _utf8_encode : function (string) {
        string = string.replace(/\r\n/g,"\n");
        var utftext = "";

        for (var n = 0; n < string.length; n++) {

            var c = string.charCodeAt(n);

            if (c < 128) {
                utftext += String.fromCharCode(c);
            }
            else if((c > 127) && (c < 2048)) {
                utftext += String.fromCharCode((c >> 6) | 192);
                utftext += String.fromCharCode((c & 63) | 128);
            }
            else {
                utftext += String.fromCharCode((c >> 12) | 224);
                utftext += String.fromCharCode(((c >> 6) & 63) | 128);
                utftext += String.fromCharCode((c & 63) | 128);
            }

        }

        return utftext;
    },

    // private method for UTF-8 decoding
    _utf8_decode : function (utftext) {
        var string = "";
        var i = 0;
        var c = c1 = c2 = 0;

        while ( i < utftext.length ) {

            c = utftext.charCodeAt(i);

            if (c < 128) {
                string += String.fromCharCode(c);
                i++;
            }
            else if((c > 191) && (c < 224)) {
                c2 = utftext.charCodeAt(i+1);
                string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
                i += 2;
            }
            else {
                c2 = utftext.charCodeAt(i+1);
                c3 = utftext.charCodeAt(i+2);
                string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
                i += 3;
            }

        }

        return string;
    }

}