How to refresh a portlet without refreshing whole page?

Question

hi
I have 3 jsp portlets on a page. Now, I can write some javascript code in a jsp and refresh it after a predetermined interval of time.
If i do this with the jsp portlet the whole page will get refreshed which is not something i want to do. i want only that jsp portlet to get refreshed.
Is it possible?
This actually is like having yahoo mail and hotmail both of them on the page and working with both of them simultaneously. Is it possible using portlets.
Pl. help
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Answer 1

Hi Little Foot,
I think it is because I use a simple input button (created manually in the code), and you use an apex built-in submit button, so it submit the page.
But since I posted that solution, I have found a better way, that allow me to get upload status, it is very simple :
Create a file browse item :
Name : P3_FILE_BROWSE
Storage Type : Table WWV_FLOW_FILES
Post Element Text : <div id="upload_status"></div>
Bind event on the element that will trigger the upload
$('#your_element').click(function(){
     if ($('#P3_FILE_BROWSE').val() != '') {
          $('#wwvFlowForm').parent().append('<iframe id="upload_iframe" name="upload_iframe" style="display:none;"></iframe>');
          $('#upload_iframe').unbind('load').load(function () {
               /* upload finished, so here you can do what you want with the uploaded file
               $('#upload_status').html('<img alt="" src="'+IMAGES_PATH+'ajax-loader.gif" style="height:28px;width:28px;" /> file processing...');
               //do what you want with the file
               $('#upload_status').html('')
               $(this).remove();
          $('#wwvFlowForm').attr('target','upload_iframe').submit().removeAttr('target');
          $('#upload_status').html('<img alt="" src="'+IMAGES_PATH+'ajax-loader.gif" style="height:28px;width:28px;" /> uploading file...');
});It automatically create the hidden iframe, submit the form into it, tell the user upload is finished, and remove the hidden iframe.
your_element can be a button, an image, etc...
Hope it can helps !
Yann.