I havea form with a file input which is hidden. There will be abutton on click of which,
the open file dialogue should pop up and when we select the file, the file should get uploaded to the server. Is this possible ?


Question: Number Slider for exposed filter using Drupal 6
Answer: Better Exposed Filters has that functionality built in


  ...
  
  What else can I do with BEF?
  
  
  Use the jQuery Slider widget for greater-than, less-than or in-between types of filters
  


I've never used it for D6 but the project page doesn't mention the slider being missing from that version or anything so it should be there.