Hello,i just started using Uploadify flash plugin instead of standard HTML UI.
And met the next problem:

when I click "Upload Files" link,that progress is shown and "completed" status is appeared, but in reality - it didn't happened anything,Java Servlet isn't called from backend.

There is upload servlet and uploading performed next way earlier:

< form enctype="multipart/form-data" method="post" target="uploadFrame"
action="<%= request.getContextPath() %>/uploadFile?portletId=${portletId}&remoteFolder=${remoteFolder}">...

After providing Uploadify plugin, UI now looks like:

plugin part(configuration):

    <script>
...  
         oScript.text+= "$j('#uploadify').uploadify({";
      oScript.text+= "'uploader' : 'kne-portlets/js/lib/uploadify/scripts/uploadify.swf',";
      oScript.text+= "'script'   : '<%= request.getContextPath() %>/uploadFile?portletId=${portletId}&remoteFolder=<%= decodedString %>',";
      oScript.text+= "'cancelImg': 'kne-portlets/js/lib/uploadify/cancel.png',";
      oScript.text+= "'folder'   : '<%= decodedString %>',";
      oScript.text+= "'queueID'  : 'fileQueue',";
      oScript.text+= "'auto'     : false,";
      oScript.text+= "'multi'    : false,";
      //oScript.text+= "'sizeLimit' : 1000";
      oScript.text+= "});";
      oScript.text+= "});"; 
...   
</script>

'scripts' parameter here points to Java Servlet on backend

<%= decodedString %> is folder path, which value is \\file-srv\demo

part for uploading:

<input type="file" name="uploadify" id="uploadify" />
<a href="javascript:$j('#uploadify').uploadifyUpload();">Upload Files</a>

Where is my fault?

'Script' param in plugin config points to Java Servlet on backend and it's done,but Servlet isn't triggered.

error, when 'script' param isn't correct:http://img190.imageshack.us/i/errormm.png/

Thank you for assistance.