var delay = 3500;
var start_frame = 0;
var lis=0;
var frame=0;
var bool=true;

function init() {
    var lis = $('slide-images').getElementsByTagName('li');
    for( i=0; i < lis.length; i++){
        if(i!=0){
            lis[i].style.display = 'none';
        }
    }
    end_frame = lis.length -1;
    start_slideshow(start_frame, end_frame, delay, lis);
}



function start_slideshow(start_frame, end_frame, delay, lis) {
     setTimeout(fadeInOut(start_frame,start_frame,end_frame, delay, lis), delay);
}

function fadeInOut(frame, start_frame, end_frame, delay, lis) {
    return (function() {
        if(bool){
            lis = $('slide-images').getElementsByTagName('li');
            Effect.Fade(lis[frame]);
            if (frame == end_frame) {
                frame = start_frame;
            } else {
                frame++;
            }
            lisAppear = lis[frame];
            setTimeout("Effect.Appear(lisAppear);", 0);
            setTimeout(fadeInOut(frame, start_frame, end_frame, delay), delay + 850);
        }
    })

}

function pause_slideshow(){
    bool=false;
//    fadeInOut(frame, start_frame, end_frame, delay, lis);
}

function play_slideshow(){
    bool=true;
    start_slideshow(start_frame, end_frame, delay, lis);
//fadeInOut(frame, start_frame, end_frame, delay, lis);
}

function show_previous_slide(){
     lis = $('slide-images').getElementsByTagName('li');
            //alert(lis);
            Effect.Fade(lis[frame]);
            if (frame == start_frame) {
                frame = end_frame;
            } else {
                frame--;
            }
            lisAppear = lis[frame];
            setTimeout("Effect.Appear(lisAppear);", 0);

}

function show_next_slide(){
    //start_slideshow(start_frame, start_frame, delay, lis);
  
            lis = $('slide-images').getElementsByTagName('li');
            Effect.Fade(lis[frame]);
            if (frame == end_frame) {
                frame = start_frame;
            } else {
                frame++;
            }
            lisAppear = lis[frame];
            setTimeout("Effect.Appear(lisAppear);", 0);
           //setTimeout(fadeInOut(frame, frame, frame+1, 10), 10);
   
}




//setTimeout(fadeInOut(frame, start_frame, end_frame, delay), delay + 1850);

Event.observe(window, 'load', init, false);