var numOfSlide=0;
var rotate_delay=3000; // delay in milliseconds (5000 = 5 secs)
var current = new Array();
var maxWidth = 380;
var maxHeight = 580;

function getForm(n){
	var nscp = (navigator.appName == "Netscape");
	if (nscp) f=document.forms["slideform"+n];
	else f=eval("document.all.slideform"+n);
	return f;
}

function getPicture(n){
	var nscp = (navigator.appName == "Netscape");
	if (nscp) p=document.images["show"+n];
	else p=eval("document.images.show"+n);
	return p;
}

function resize(pic){
	img=new Image(); img.src=pic.src;

	if(img.height>maxHeight){
		pic.width=(maxHeight/img.height)*img.width;
		pic.height=maxHeight;
	} else pic.height=img.height;

	if(img.width>maxWidth){
		pic.width=maxWidth;
		pic.height=(maxWidth/img.width)*img.height;
	} else pic.width=img.width;
}

function loaded(){
	var n=1;
	while(frm=getForm(n++)) numOfSlide++;

	for(var i=1;i<(numOfSlide+1);i++){
		frm=getForm(i);
		frm.slide.selectedIndex=0;
		current[i]=0;
		pic=getPicture(i);
		resize(pic);
	}
}

function next(n) {
	frm=getForm(n);
	pic=getPicture(n);
	if (frm.slide[current[n]+1]) {
		pic.src = frm.slide[current[n]+1].value;
		resize(pic);
		frm.slide.selectedIndex = ++current[n];
	} else first(n);
}

function previous(n) {
	frm=getForm(n);
	pic=getPicture(n);
	if (current[n]-1 >= 0) {
		pic.src = frm.slide[current[n]-1].value;
		resize(pic);
		frm.slide.selectedIndex = --current[n];
	} else last(n);
}

function first(n) {
	frm=getForm(n);
	pic=getPicture(n);
	current[n] = 0;
	pic.src = frm.slide[0].value;
	resize(pic);
	frm.slide.selectedIndex = 0;
}

function last(n) {
	frm=getForm(n);
	pic=getPicture(n);
	current[n] = frm.slide.length-1;
	pic.src = frm.slide[current[n]].value;
	resize(pic);
	frm.slide.selectedIndex = current[n];
}

function ap(n,text) {
	frm=getForm(n);
	frm.slidebutton.value = (text == "Stop") ? "Start" : "Stop";
	rotate(n);
}

function change(n) {
	frm=getForm(n);
	pic=getPicture(n);
	current[n] = frm.slide.selectedIndex;
	pic.src = frm.slide[current[n]].value;
	resize(pic);
}

function rotate(n) {
	frm=getForm(n);
	pic=getPicture(n);
	if (frm.slidebutton.value == "Stop") {
		current[n] = (current[n] == frm.slide.length-1) ? 0 : current[n]+1;
		pic.src = frm.slide[current[n]].value;
		resize(pic);
		frm.slide.selectedIndex = current[n];
		window.setTimeout("rotate("+n+")", rotate_delay);
   }
}