var rotate_photo_delay = 5000; // delay in milliseconds (5000 = 5 secs)
current = 0;
function next_photo() {
if (document.slideform.slide[current+1]) {
document.images.show.src = document.slideform.slide[current+1].value;
document.slideform.slide.selectedIndex = ++current;
   }
else first_photo();
}
function previous_photo() {
if (current-1 >= 0) {
document.images.show.src = document.slideform.slide[current-1].value;
document.slideform.slide.selectedIndex = --current;
   }
else last_photo();
}
function first_photo() {
current = 0;
document.images.show.src = document.slideform.slide[0].value;
document.slideform.slide.selectedIndex = 0;
}
function last_photo() {
current = document.slideform.slide.length-1;
document.images.show.src = document.slideform.slide[current].value;
document.slideform.slide.selectedIndex = current;
}
function ap_photo(text) {
document.slideform.slidebutton.value = (text == "Stop") ? "Start" : "Stop";
rotate_photo();
}
function change_photo() {
current = document.slideform.slide.selectedIndex;
document.images.show.src = document.slideform.slide[current].value;
var txtArea = document.slideform.imgdesc;
txtArea.value=document.slideform.imgdesctxt[current].value;
var link = document.slideform.imglink;
console.log(document.slideform);
console.log(document.slideform.imglink);
link.href=document.slideform.imgurl[current].value;
}
function rotate_photo() {
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;
window.setTimeout("rotate_photo()", rotate_photo_delay);
   }
}