var scroll;
var pages;
var curPage = 1;
var backtrack;
var top = 0;
var steps = 0;
var timer;
var mover;
var hold;

window.onload = getScroll;

function getScroll(){
	scroll = document.getElementById("scroll");
	//alert(scroll);
	timer = setTimeout('startSlide()', 2000);
}

function startSlide(){
//check to make sure the last page hasn't been passed;
	if(curPage == pages){
		curPage = 1;
		backtrack = setInterval("rollBack()", 25);
	}else{
		mover = setInterval("movePic()", 50);
	}
}

function rollBack(){
	top += 118.4;
	scroll.style.top = top + "px";
	steps -= 2;
	if(steps == 0){
		scroll.style.top = "0px";
		clearInterval(backtrack);
		setTimeout("startSlide()", 3000);
	}
}

function stopSlide(){
	clearTimeout(mover);
	if(curPage > 1){
		top = -592 * (curPage);
		--curPage;
	}else{
		top = 0;
		
	}
	scroll.style.top = top + "px";	
}

function movePic(){
	top -= 59.2;
	scroll.style.top = top + "px";
	steps++;
	if(steps == 10 * curPage){
		clearInterval(mover);
		curPage++;
		setTimeout("startSlide()", 3000);
	}
}

function choosePic(pic){
	//alert("Hello");
	stopSlide();
	clearInterval()
	top = pic * -592;
	//alert(top);
	steps = pic * 10;
	scroll.style.top = top + "px";
}