AdditionalFormName does not work...

//For ActiveX control full path to CAB file (including file name) should be specified.
iu.activeXControlCodeBase = "ImageUploader4.cab";
iu.activeXControlVersion = "4,0,33,0";

iu.showNonemptyResponse = "alert";

//Configure appearance and behaviour.
iu.addParam("PaneLayout", "TwoPanes");
iu.addParam("TreePaneWidth", "205");
iu.addParam("ShowButtons", "False");
iu.addParam("CheckFilesBySelectAllButton", "True");
iu.addParam("ShowDebugWindow", "false");

iu.addParam("FileMask","*.pdf;*.esx;*.dds;*.xls;*.doc;*.jpg;*.jpeg;*.gif;*.tif;*.tiff;*.bmp;*.png;*.xcx");
iu.addParam("FileIsTooLargeText", "File is too large.");
iu.addParam("MessageMaxFileSizeExceededText", "Max filesize exceeded.");

iu.addParam("UploadThumbnail1FitMode", "fit");
iu.addParam("UploadThumbnail1Width", "120");
iu.addParam("UploadThumbnail1Height", "120");
iu.addParam("UploadThumbnail1JpegQuality", "60");

iu.addParam("ShowDebugWindow", "True");
iu.addParam("AdditionalFormName", "aForm");
iu.addParam("EnableRotate", "False");
iu.addParam("CodePage", "1252");
iu.addParam("ShowUploadCompleteMessage", "False");

//Configure colors.
iu.addParam("BackgroundColor", "#ffffff");
iu.addParam("SplitterLineColor", "#0066cc");

//Configure border and splitter line style.
iu.addParam("FolderPaneBorderStyle", "None"); //NOT SUPPORTED IN JAVA
iu.addParam("UploadPaneBorderStyle", "None"); //NOT SUPPORTED IN JAVA
iu.addParam("TreePaneBorderStyle", "None"); //NOT SUPPORTED IN JAVA
iu.addParam("SplitterLineStyle", "Dot"); //NOT SUPPORTED IN JAVA

//Configure thumbnail settings.
iu.addParam("UploadThumbnail1FitMode", "Fit");
iu.addParam("UploadThumbnail1Width", "120");
iu.addParam("UploadThumbnail1Height", "120");
iu.addParam("UploadThumbnail1JpegQuality", "60");

//Configure user quota restriction. In real-life application these values should be 
//loaded from server.
iu.addParam("MaxFileCount", "10");
iu.addParam("MaxFileSize", "52428800");

//Configure upload settings.
iu.addParam("FilesPerOnePackageCount", "100");	// 100 files go in one request.
iu.addParam("AutoRecoverMaxTriesCount", "10");
iu.addParam("AutoRecoverTimeOut", "10000");

//Configure URL files are uploaded to.
iu.addParam("Action", "upload.cpic?_event_=upload");   //

//Tell Image Uploader writer object to generate all necessary HTML code to embed 
//Image Uploader to the page.
iu.writeHtml();