var rotate_delay = 4000; // delais en microseconde (4000 = 4 secs)
     current = 0;
    
     function lessdelay() {
     if (rotate_delay <= 1000) {
     rotate_delay = rotate_delay-100;
     document.slideform.delay.value = rotate_delay;
     }else {
     rotate_delay = rotate_delay-500;
     document.slideform.delay.value = rotate_delay;
     }
     }
    
     function moredelay() {
     if (rotate_delay < 1000) {
     rotate_delay = rotate_delay+100;
     document.slideform.delay.value = rotate_delay;
     }else {
     rotate_delay = rotate_delay+500;
     document.slideform.delay.value = rotate_delay;
     }
     }
    
     function next() {
     if (document.slideform.slide[current+1]) {
     document.images.show.src = document.slideform.slide[current+1].value;
     document.slideform.slide.selectedIndex = ++current;
     }else first();
     }
    
     function previous() {
     if (current-1 >= 0) {
     document.images.show.src = document.slideform.slide[current-1].value;
     document.slideform.slide.selectedIndex = --current;
     }else last();
     }
    
     function first() {
     current = 0;
     document.images.show.src = document.slideform.slide[0].value;
     document.slideform.slide.selectedIndex = 0;
     }
    
     function last() {
     current = document.slideform.slide.length-1;
     document.images.show.src = document.slideform.slide[current].value;
     document.slideform.slide.selectedIndex = current;
     }
    
     function ap(text) {
     document.slideform.slidebutton.value = (text == "Stop") ? " > " : "Stop";
     rotate();
     }
     function change() {
     current = document.slideform.slide.selectedIndex;
     document.images.show.src = document.slideform.slide[current].value;
     }
    
     function rotate() {
     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()", rotate_delay);
}