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 slider page is loaded i want to hide the "previousbutton"
when i click "next" button the "previous" button should display and when i go to last slide "next" button should hide

how can i do this

any one pls help me out

i am using "Slider " module and drupal 6

thanks and regards