Code:
function nextSlide(def) {
      try {
      val2 = document.list.list.options[document.list.list.selectedIndex+1].value
        path = def+"\\"+val2
      //document.write (path)
      document.getElementById("picture").innerHTML = "<img src='"+path+"'/>"
      document.list.list.selectedIndex = document.list.list.selectedIndex+1
      }
      catch (exeption) {
          clearInterval(timer)
          alert('Done!')
      }
}


function slideShow(pth) {
    timeMSec = parseInt(document.nav.ssto.value) * 1000
    //    document.write(pth)
    timer = setInterval([b]'nextSlide(pth)'[/b], timeMSec, "javascript")
}