function slide(direction, root, max) 
// direction	: increment value or decrement value
// root		: filename root
// max		: number of files
//
// last mod 6/14/97 t. ciccateri
{
  var cur_img_str = document.images[2].src
  var dot_pos = cur_img_str.lastIndexOf(".") 
  var cur_slide = cur_img_str.charAt(dot_pos - 1)
  var next_slide = eval(cur_slide) + eval(direction)
  if (next_slide == max) {
    next_slide = 0
  }
 if (next_slide == -1) {
    next_slide = max-1
  }

  document.images[2].src="/nmvbp/graphics/jpeg/" + root + next_slide + ".jpg"
  //document.write("filename = " + document.images[2].src)
 // document.write("next_slide = " + next_slide)
}