var scrollerheight=90; // 스크롤러의 세로 (li가 4개)
var html,total_area=0
var scroll_interval;

var scrollspeed = 1;		// Scrolling 속도         
var waitingtime = 5000;		// 멈추는 시간
var s_tmp = 0, s_amount = 90;//스크롤되는 양
var startPanel=0, n_panel=0, i=0;

function startscroll()
{ // 스크롤 시작
	i=0;
	for (i in scroll_content)
		n_panel++;
		
	n_panel = n_panel -1 ;
	startPanel = Math.round(Math.random()*n_panel);
	if(startPanel == 0)
	{
		i=0;
		for (i in scroll_content) 
			insert_area(total_area, total_area++); // area 삽입
	}
	else if(startPanel == n_panel)
	{
		insert_area(startPanel, total_area);
		total_area++;
		for (i=0; i<startPanel; i++) 
		{
			insert_area(i, total_area); // area 삽입
			total_area++;
		}
	}
	else if((startPanel > 0) || (startPanel < n_panel))
	{
		insert_area(startPanel, total_area);
		total_area++;
		for (i=startPanel+1; i<=n_panel; i++) 
		{
			insert_area(i, total_area); // area 삽입
			total_area++;
		}
		for (i=0; i<startPanel; i++) 
		{
			insert_area(i, total_area); // area 삽입
			total_area++;
		}
	}
	scroll_interval = setInterval("scrolling()", waitingtime);
}
function scrolling(){ // 실제로 스크롤 하는 부분
	if (scroll_content_act)
	{
		for (i=0;i<total_area;i++){
			tmp = document.getElementById('scroll_area'+i).style;
			tmp.top = parseInt(tmp.top)-scrollspeed;
			if (parseInt(tmp.top) <= -scrollerheight){
				tmp.top = scrollerheight*(total_area-1);
			}
		}
		if (s_tmp++ >= (s_amount - 1)){
			clearInterval(scroll_interval);
			s_tmp = 0;
			scroll_interval = setInterval("scrolling()", waitingtime);
			return;
		}
	}
	clearInterval(scroll_interval);
	scroll_interval = setInterval("scrolling()", 1);
}
function scrolling_next(){ // 실제로 스크롤 하는 부분
	for (i=0;i<total_area;i++){
		tmp = document.getElementById('scroll_area'+i).style;
		var start = tmp.top;
		if (parseInt(tmp.top) <= 0) {
			tmp.top = scrollerheight*(total_area - 1);
		} else {
			if (parseInt(tmp.top)%scrollerheight == 0)
				tmp.top = parseInt(parseInt(tmp.top)/scrollerheight - 1)*scrollerheight;
			else
				tmp.top = parseInt(parseInt(tmp.top)/scrollerheight)*scrollerheight;
		}
	}
	clearInterval(scroll_interval);
	s_tmp = 0;
	scroll_interval = setInterval("scrolling()", waitingtime);
}

function insert_area(idx, n){ // area 삽입
	html='<ul style="top:'+(scrollerheight*n)+'px" id="scroll_area'+n+'" class="circle">\n';
	html+=scroll_content[idx]+'\n';
	html+='<\/ul>\n';
	document.write(html);
}