duration 	= 5000;
current 	= 0;

function next() {
  if (document.slideform.slide[current+1]) {
    document.images.show.src = document.slideform.slide[current+1].value;
    document.slideform.slide.selectedIndex = ++current;
    
    picture_no=document.getElementById("picture_no");
 		document.getElementById('current_picture_no').innerHTML = picture_no.options[picture_no.selectedIndex].text;
   }
else first();
}

function previous() {
  if (current-1 >= 0) {
  document.images.show.src = document.slideform.slide[current-1].value;
  document.slideform.slide.selectedIndex = --current;
  
  picture_no=document.getElementById("picture_no");
 	document.getElementById('current_picture_no').innerHTML = picture_no.options[picture_no.selectedIndex].text;
   }
  else last();
}

function first() {
  current = 0;
  document.images.show.src = document.slideform.slide[0].value;
  document.slideform.slide.selectedIndex = 0;
  
  picture_no=document.getElementById("picture_no");
  document.getElementById('current_picture_no').innerHTML = picture_no.options[picture_no.selectedIndex].text;
}

function last() {
  current = document.slideform.slide.length-1;
  document.images.show.src = document.slideform.slide[current].value;
  document.slideform.slide.selectedIndex = current;
  
  picture_no=document.getElementById("picture_no");
 	document.getElementById('current_picture_no').innerHTML = picture_no.options[picture_no.selectedIndex].text;
}

function ap(text) {

  document.slideform.slidebutton.value = (text == "Stop") ? "Start" : "Stop";
  rotate();
}

function change() {
  current = document.slideform.slide.selectedIndex;
  document.images.show.src = document.slideform.slide[current].value;
 
 	picture_no=document.getElementById("picture_no");
 	document.getElementById('current_picture_no').innerHTML = picture_no.options[picture_no.selectedIndex].text;
}

function rotate() { 
  if (document.slideform.slidebutton.value == "Stop") {
    current = (current == document.slideform.slide.length-1) ? 0 : current+1;
    document.images.show.src = document.slideform.slide[current].value;
    document.slideform.slide.selectedIndex = current;
    
    picture_no=document.getElementById("picture_no");
 		document.getElementById('current_picture_no').innerHTML = picture_no.options[picture_no.selectedIndex].text;
    
 		window.setTimeout("rotate()",  5000);
   }
}