Cluetip on file field: window to select file doesn't open

Cluetip on file field: window to select file doesn't open

Hello I am testing Jquery and cluetip and I have a problem when I put a tooltip on a input file field. The tooltip is diaplayed but it doesn't open the window to choose the file when I select the field (nor when I type on the browse button)

Here is the html line
 
  1. <input class="tooltip" id="picture_picture" name="picture[picture]" size="30" title="Fichier | Sélectionnez la photo sur votre ordinateur (Seuls les formats jpg, png, gif sont acceptés)." type="file" />


and my javascript

  
  1. $('input.tooltip').cluetip({splitTitle: '|', arrows: true});



Any idea?
Thanks
Nicolas