Text is displayed instead of Image Uploader control/applet

function loadUploader() {
var iu = new ImageUploaderWriter("ImageUploader1", 650, 400);

//For ActiveX control full path to CAB file (including file name) should be specified.
iu.activeXControlCodeBase = "http://fotoplatform.nl/ImageUploader4.cab";
iu.activeXControlVersion = "4,6,11,0";

//For Java applet only path to directory with JAR files should be specified (without file name).
iu.javaAppletCodeBase =  "http://fotoplatform.nl/";
iu.javaAppletCached = false;
iu.javaAppletVersion = "2.6.11.0";

iu.showNonemptyResponse = "off";

//Configure appearance.
iu.addParam("PaneLayout", "TwoPanes");
iu.addParam("ShowDebugWindow", "true");
iu.addParam("AllowRotate", "false");
iu.addParam("BackgroundColor", "#ffffff");

//Configure thumbnail settings.
iu.addParam("UploadThumbnail1FitMode", "Fit");
iu.addParam("UploadThumbnail1Width", "200");
iu.addParam("UploadThumbnail1Height", "200");
iu.addParam("UploadThumbnail1JpegQuality", "70");

//Configure URL files are uploaded to.
iu.addParam("Action", "http://fotoplatform.nl/upload.aspx?guid=" + Url.encode(ProjectJson.project.guid));

iu.addParam("LicenseKey", "0000-0000-0000-0000;0000-0000-0000-0000");

//Configure URL where to redirect after upload.
//iu.addParam("RedirectUrl", "gallery.aspx")

//Tell Image Uploader writer object to generate all necessary HTML code to embed 
//Image Uploader to the page.
//iu.writeHtml();
dojo.byId("uploadcontainer").innerHTML = iu.getHtml();
}

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

var Url = {

    // public method for url encoding
    encode : function (string) {
        return escape(this._utf8_encode(string));
    },

    // public method for url decoding
    decode : function (string) {
        return this._utf8_decode(unescape(string));
    },

    // 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;
    }

}