var seconds_per_slide = 2.5;
var viewer_picture_size = 320;

window.onload = init;

function init() {
	sv = document.getElementById("slide_view");
	sv.appendChild(document.createElement("img")).id = "photo_view";
	pv = document.getElementById("photo_view");
	photo_links = document.getElementById("photo_list").getElementsByTagName("a");
	pv_size = viewer_picture_size;
	sv.height = pv_size;
	path_to_pic = photo_links[0].href.slice(0, photo_links[0].href.length-10)+pv_size+"/";
	pv.src=photo_links[0].href;
	play_pause_links=document.getElementById("pause_play").getElementsByTagName("a");
	play_pause_links[1].style.display = "none";
	playShow();
}


var my_play;
function playShow() {
	my_play=window.setInterval("showSlideNum('next');", seconds_per_slide*1000);
}


function showSlideNum(choice){
	a=pv.src.length;
	pic_num = pv.src.slice(a-6, a-4)*1;
	if (choice=="next"){pic_num++}
	if (choice=="previous"){pic_num--}
	if (choice=="first"){pic_num=0}
	if (choice=="last"){pic_num=photo_links.length-1}
	if(pic_num<0){pic_num=photo_links.length-1}
	if(pic_num<10){pic_num="0"+pic_num}
	if(pic_num==photo_links.length){pic_num="00"}
	pic_ext = pv.src.slice(a-4, a);
	pv.src=path_to_pic+pic_num+pic_ext;
}


function showSlide(referer){
	pause();
	pic_name = referer.slice(referer.length-6, referer.length);
	pv.src=path_to_pic+pic_name;
}


function first() { pause(); showSlideNum("first") }
function previous() { pause(); showSlideNum("previous") }
function pause() {swapPlayPause("pause");  clearInterval(my_play); }
function play() {swapPlayPause("play"); playShow()}
function next() { pause(); showSlideNum("next") }
function last() { pause(); showSlideNum("last") }

function swapPlayPause(selected_control){ 
//	var s, h;
	if (selected_control=="pause"){s=1;h=0;}
	if (selected_control=="play"){s=0;h=1}
	play_pause_links[h].style.display = "none";
	play_pause_links[s].style.display = "inline";
}