buttons problem in slider

Hi all

I am using slider module for sliding the content page. I want change the "next" and "previous" button. When the slider page is loaded, I want to hide the "previous" button. When I click the "next" button, the "previous" button should display, and when I go to the last slide, the "next" button should hide.

How can i do this?

I am using "Slider " module and Drupal 6.

any one pls help me out