//初期動作
$(document).ready(function(){
	preload([
		"/common/img/main_img04_02.jpg",
		"/common/img/main_img04_01.jpg",
		"/common/img/main_img04_00.jpg",
		"/common/img/white.jpg"
	]);
});

var now;
var maxNum;

function preload(imgs){
  var objArray = [];
  now=imgs.length-1;
  maxNum=now;
  for(var i = 0; i < imgs.length; i++){
    var imgObj = new Image();
    imgObj.src = imgs[i];
    objArray.push(imgObj);
  }
  var viewStatus = function(){
    var count = 0;
    for(var i = 0; i < objArray.length; i++){
      if(objArray[i].complete) count++;
    }
    if(count == objArray.length){
      document.getElementById("main").innerHTML='';
	  for(var i = 0; i < objArray.length; i++){
		  document.getElementById("main").innerHTML+='<img src="'+imgs[i]+'" />';
	  }
	  start();
    }
    if(count < objArray.length){
      setTimeout(viewStatus, 100);
    }
  };
  viewStatus();
}

var timerID;
function start(){
	timerID=setTimeout("slide()", 1000);
}
function slide(){
	var n;
	if(now==1){
		n=1000;
	}else if(now==maxNum){
		n=1000;
	}else{
		n=2000;
	}
	$("#main img:nth-child("+(now+1)+")").fadeOut(n,reStart());
}
function reStart(){
	now--;
	clearTimeout(timerID);
	if(now>0){
		start();
	}else{
		$("#btn_top_comic").show();
	}
		
}