function showimg1(){
document.mainimg.src = "images/p_union110922.jpg";
}

function showimg2(){
document.mainimg.src = "images/p_collective110922.jpg";
}

function showimg3(){
document.mainimg.src = "images/p_cartonnage110922.jpg";
}
 
function showimg4(){
document.mainimg.src = "images/p_pacific110922.jpg";
}
 
var mainimgIMG = new Array();
mainimgIMG[0] = new Image();
mainimgIMG[0].src = "images/p_union110922.jpg";
mainimgIMG[1] = new Image();
mainimgIMG[1].src = "images/p_collective110922.jpg";
mainimgIMG[2] = new Image();
mainimgIMG[2].src = "images/p_cartonnage110922.jpg";
mainimgIMG[3] = new Image();
mainimgIMG[3].src=  "images/p_pacific110922.jpg";

var unionIMG = new Array();
unionIMG[0] = new Image();
unionIMG[0].src = "images/bt_union110922_on.jpg";
unionIMG[1] = new Image();
unionIMG[1].src = "images/bt_union110922.jpg";
unionIMG[2] = new Image();
unionIMG[2].src = "images/bt_union110922.jpg";
unionIMG[3] = new Image();
unionIMG[3].src = "images/bt_union110922.jpg";

var collectiveIMG = new Array();
collectiveIMG[0] = new Image();
collectiveIMG[0].src = "images/bt_collective110922.jpg";
collectiveIMG[1] = new Image();
collectiveIMG[1].src = "images/bt_collective110922_on.jpg";
collectiveIMG[2] = new Image();
collectiveIMG[2].src = "images/bt_collective110922.jpg";
collectiveIMG[3] = new Image();
collectiveIMG[3].src = "images/bt_collective110922.jpg";

var cartonnageIMG = new Array();
cartonnageIMG[0] = new Image();
cartonnageIMG[0].src = "images/bt_cartonnage110922.jpg";
cartonnageIMG[1] = new Image();
cartonnageIMG[1].src = "images/bt_cartonnage110922.jpg";
cartonnageIMG[2] = new Image();
cartonnageIMG[2].src = "images/bt_cartonnage110922_on.jpg";
cartonnageIMG[3] = new Image();
cartonnageIMG[3].src = "images/bt_cartonnage110922.jpg";

var pacificIMG = new Array();
pacificIMG[0] = new Image();
pacificIMG[0].src = "images/bt_pacific110922.jpg";
pacificIMG[1] = new Image();
pacificIMG[1].src = "images/bt_pacific110922.jpg";
pacificIMG[2] = new Image();
pacificIMG[2].src = "images/bt_pacific110922.jpg";
pacificIMG[3] = new Image();
pacificIMG[3].src = "images/bt_pacific110922_on.jpg";




opa=20;
opacnt=30;
timer=100;

function FadeInstr() {
gazouId = "mainimg";
MyIMG = document.getElementById(gazouId);
MyIMG.style.visibility = "visible";
FadeIn1(gazouId,opa);
}

function FadeIn1(gazouId,opa) {
if (opa <= 100) {
document.getElementById(gazouId).style.filter = "alpha(opacity:"+opa+")";  // IE のソース
document.getElementById(gazouId).style.opacity = opa/100;   //Mozilla
opa += opacnt;
setTimeout("FadeIn1('"+gazouId+"',"+opa+")", timer);
}
}







//画像番号用のグローバル変数
var cnt=0;

//画像切り替え関数
function ChangeIMG(){

  if (cnt==3)
  { cnt=0; }
  else
  { cnt++; }
  
document.getElementById("mainimg").src=mainimgIMG[cnt].src;
  document.getElementById("union").src=unionIMG[cnt].src;
  document.getElementById("collective").src=collectiveIMG[cnt].src;
  document.getElementById("cartonnage").src=cartonnageIMG[cnt].src;
  document.getElementById("pacific").src=pacificIMG[cnt].src;
}

function BackIMG(){
  if (cnt==0)
  { cnt=3; }
  else
  { cnt--; }
  
document.getElementById("mainimg").src=mainimgIMG[cnt].src;
  document.getElementById("union").src=unionIMG[cnt].src;
  document.getElementById("collective").src=collectiveIMG[cnt].src;
  document.getElementById("cartonnage").src=cartonnageIMG[cnt].src;
  document.getElementById("pacific").src=pacificIMG[cnt].src;
}