var last_article_id;
var cur_article_id;

$(function(){
	last_article_id = get_last_article_id();
	cur_article_id = get_cur_article_id();

	$(".at_read_icon").click(function(event){
		var id = $(this).parents(".question").attr("id").replace(/[^\d]/g,'');
		toggle_article( id );
		event.preventDefault();
		return false;
	})

	$(".at_page_no").click(function(event){
		var id = $(this).attr("id").replace(/[^\d]/g,'');
		if ( $("#a" + id).css("display") == "none" ){
			toggle_article( id );
		}
		event.preventDefault();
		return false;
	})

	$("#at_page_prev").click(function(event){
		var id = cur_article_id - 1;
		if ( id >= 1 ){
			toggle_article( id );
		}
		event.preventDefault();
		return false;
	})

	$("#at_page_next").click(function(event){
		var id = cur_article_id + 1;
		if ( id <= last_article_id ){
			toggle_article( id );
		}
		event.preventDefault();
		return false;
	})
})

function toggle_article( id )
{
	if ( id != cur_article_id )
	{
		$("#a" + cur_article_id).css("display","none");
		$("#q" + cur_article_id + " .at_read_icon").css("cursor","pointer");
		$("#q" + cur_article_id + " .at_read_icon").find("img").attr("src","read01.gif");
		$("#a" + id).css("display","block");
		$("#q" + id + " .at_read_icon").css("cursor","default");
		$("#q" + id + " .at_read_icon").find("img").attr("src","read02.gif");
		cur_article_id = parseInt(id);
		set_article_paging();
	}
}

function set_article_paging()
{
	$(".at_page_no").each(function(){
		var id = $(this).attr("id").replace(/[^\d]/g,'');
		var bot_no = parseInt(id) + 1;
		if (bot_no < 10){
			bot_no = "0" + bot_no;
		}

		var img;
		if ( id == cur_article_id ){
			img = "menu02-bot" + bot_no + "a.gif";
		}else{
			img = "menu02-bot" + bot_no + ".gif";
		}

		if ( $(this).find("img").attr("src") != img ){
			$(this).find("img").attr("src",img);
		}
	})

	if ( cur_article_id == 1 ){
		$("#at_page_prev").css("cursor","default");
		$("#at_page_prev").find("img").attr("src","menu02-bot01a.gif");
	}else{
		$("#at_page_prev").css("cursor","pointer");
		$("#at_page_prev").find("img").attr("src","menu02-bot01.gif" );
	}
	if ( cur_article_id == last_article_id ){
		$("#at_page_next").css("cursor","default");
		$("#at_page_next").find("img").attr("src","menu02-bot06a.gif" );
	}else{
		$("#at_page_next").css("cursor","pointer");
		$("#at_page_next").find("img").attr("src","menu02-bot06.gif" );
	}
}

function get_cur_article_id()
{
	var cur = 1;
	$(".answer").each(function(){
		if ( $(this).css("display") == "block" ){
			cur = $(this).attr("id").replace(/[^\d]/g,'');
		}
	})
	return parseInt(cur);
}

function get_last_article_id()
{
	var last = 0;
	$(".answer").each(function(){
		var no = $(this).attr("id").replace(/[^\d]/g,'');
		if ( no > last )
			last = no;
	})
	return parseInt(last);
}