var jx = 
{
    http : false,// We create the HTTP Object
    format : 'text',
    callback : function(data){},
    error: function(err) {alert(err);},
    //Create a xmlHttpRequest object - this is the constructor. 
    getHTTPObject : function() 
    {
        var http = false;

        //Use IE's ActiveX items to load the file.
        if(typeof ActiveXObject != 'undefined') 
        {
            try 
            {
                http = new ActiveXObject("Msxml2.XMLHTTP");
            }
            catch (e) 
            {
                try 
                {
                    http = new ActiveXObject("Microsoft.XMLHTTP");
                }
                catch (E) 
                {
                    http = false;
                }
            }
        } 
        else if (XMLHttpRequest) 
        {
            try 
            {
                http = new XMLHttpRequest();
            }
            catch (e) 
            {
                http = false;
            }
        }
        return http;
    },
    load : function (url,callback,format, method, errcallback) 
    {
        this.init(); //The XMLHttpRequest object is recreated at every call - to defeat Cache problem in IE
        if(!this.http||!url) 
            return;

        if(!method)
        {
            method="GET";
        }
        this.callback=callback;
        if(!format) format = "text";//Default return type is 'text'
        this.format = format.toLowerCase();
        var ths = this;//Closure
        //Kill the Cache problem in IE.
        var now = "uid=" + new Date().getTime();
        url += (url.indexOf("?")+1) ? "&" : "?";
        url += now;
        this.http.open(method, url, true);
        this.http.onreadystatechange = function() 
        {   //Call a function when the state changes.
            if(!ths) return;
            var http = ths.http;
            if (http.readyState == 4) 
            {
                //Ready State will be 4 when the document is loaded.
                if (http.status == 200) 
                {
                    var result = "";
                    if(http.responseText) result = http.responseText;
                    //alert(result);
                    //If the return is in JSON format, eval the result before returning it.
                    if(jx.format.charAt(0) == "j") 
                    {
                        result = result.replace(/[\n\r]/g,"");//\n's in the text to be evaluated will create problems in IE
                        result = eval('('+result+')'); 
                    }                     
                    //Give the data to the callback function.
                    if(jx.callback) jx.callback(result, http);
                }
                else 
                { 
                    //An error occured
                    if(errcallback)
                    {
                        errcallback(http.status, http.statusText);
                    }                    
                    else if(ths.error) 
                    {
                        ths.error(http.status + " " + http.statusText);
                    }
                }
            }
        }
        
        this.http.send(null);
    },

    init:function()
    {
        this.http=this.getHTTPObject();
    }
}    
function doAWSUpload(idForm, url, errorCallback)
{
    var form = document.getElementById(idForm);
    // need to encode the file name - if the filename has an '&' (or for ie, if anywhere in the full file path there is an '&'), 
    // that & is not url encoded in ff or ie. this is to fix that case.
    url = url + "&" + urlEncode({file: form.file.value}) + "&transport=direct";

    //alert(url);
    
    var afterUpload = function(result)
    {
        if(result.jsonerror)
        {
            if(errorCallback)
            {
                errorCallback(0, result.jsonerror);
            }    
            else
            {
            alert(result.jsonerror);
        }
        }
        else
        {
            // see http://developer.amazonwebservices.com/connect/entry.jspa?externalID=1434&categoryID=55
            form.key.value = result.key;
            form.AWSAccessKeyId.value = result.AWSAccessKeyId;
            form.acl.value = result.acl;
            form.success_action_redirect.value = result.success_action_redirect;
            form.policy.value = result.policy;
            form.signature.value = result.signature;
            form['Content-Type'].value = result['Content-Type'];
            var isIE = window.ActiveXObject ? true : false;
            // TODO: figure out why https doe snot work in IE - it does not work even when 
            // u do a simple html with the form action to https and rest of the inputs directly filled in the html (no java script use)

            // for safari also, it is an issue - will prompt to accept cert in an upload. If we are in an iframe, as we are for our fb apps, it causes incorrect navigation.
            //if(isIE)
            {
                var idx = result.action.indexOf("https:");
                if(idx == 0)
                {
                    result.action = "http:" + result.action.substring(6 /*length of https:*/);
                }
            }
            form.action = result.action;  
            
            /*
            alert(result.AWSAccessKeyId);
            alert(result.acl);
            alert(result.success_action_redirect);
            alert(result['Content-Type']);
            alert(result.policy);
            alert(result.signature);
            alert(form.action);
            */
            form.submit();
        }
    }
    //alert("url=" + url);
    if(errorCallback)
    {
        jx.load(url, afterUpload, "json", "GET", errorCallback);
    }
    else
    {
    jx.load(url, afterUpload, "json");
    }
}


function createDelegate(fn, scope, args)
{
    var fnDelegate = function()
    {
        fn.call(scope, args);
    }
    return fnDelegate;
}

/*
function dumpObjectLevels(obj, levels)
{
    return  dump("","",obj, 0, levels, true);
}

function dump(strPrefix, indentStr, obj, curlevel, maxlevels, force)
{
    var strToReturn ="";
    if(maxlevels == -1 || curlevel < maxlevels)
    {
        if (obj == null)
        {
            strToReturn = "[null]";
        }
        else if (typeof(obj) == "function")
        {
            strToReturn = "[function]";
        }
        else if (typeof(obj) == "number" || typeof(obj) == "string" ||typeof(obj) == "boolean")
        {
            strToReturn = obj;
        }
        else 
        {
            strToReturn +="{";
            var isFirst = true;
            for (var propName in obj)
            {
                if(isFirst)
                {
                    isFirst = false;
                }
                else
                {
                    strToReturn += ', ';    
                }
                strToReturn += indentStr + propName + ": ";
                try
                {
                    strToReturn += dump(strPrefix, indentStr + "  ", obj[propName], curlevel + 1, maxlevels, force);
                }
                catch(err)
                {
                    strToReturn += err;
                }
            }
            strToReturn +="}\n";
        }
    }
    
    return strPrefix + strToReturn;
}

*/

// querystring to POST JavaScript
// copyright 15th October 2007 by Stephen Chapman
// permission to use this Javascript on your web page is granted
// provided that all of the code in this script (including these
// comments) is used without any alteration
function toPost(getString, newTab) 
{
    var parms = getString.split('?'); 
    var newF = document.createElement("form"); 
    newF.action = parms[0]; 
    newF.method = 'POST'; 
    if(newTab)
    {
        newF.target = "_blank";
    }
    var parms = parms[1].split('&'); 
    for (var i=0; i<parms.length; i++) 
    {
        var pos = parms[i].indexOf('='); 
        if (pos > 0) 
        {
            var key = parms[i].substring(0,pos); 
            var val = parms[i].substring(pos+1);  
            /*@cc_on @if (@_jscript)  var newH = document.createElement("<input name='"+key+"'>");  @else */  
            var newH = document.createElement("input"); 
            newH.name = key; /* @end @*/ 
            newH.type = 'hidden'; 
            newH.value = unescape(val); 
            newF.appendChild(newH);
        }
    } 
    document.getElementsByTagName('body')[0].appendChild(newF); 
    newF.submit();
}

// from http://www.xml.com/pub/a/2005/11/09/fixing-ajax-xmlhttprequest-considered-harmful.html?page=2

function getDataFromServer(id, url) 
{    
    // Fetch the element pointed to by the id. If it exists, we destroy it so we can create a new one.
    var oScript = document.getElementById(id);

    // Point at the script tag, if it exists
    var head = document.getElementsByTagName("head").item(0);
     // Destroy the tag, if it exists
    if (oScript) 
    {
        // Destory object
        head.removeChild(oScript);
    }    
    // Create the new script tag
    oScript = document.createElement("script");

    // Setup the src attribute of the script tag
    oScript.setAttribute("src", url);

    // Set the id attribute of the script tag
    oScript.setAttribute("id", id);

    // Create the new script tag which causes the proxy to be called
    head.appendChild(oScript);
}