/* 画像の先行読み込み */
if(document.images) {
var imgs = new Array();
imgs[0] = new Image();  imgs[0].src = "img/img07-2.jpg"; 
imgs[1] = new Image();  imgs[1].src = "img/img20-2.gif"; 
imgs[2] = new Image();  imgs[2].src = "img/img21-2.gif"; 
imgs[3] = new Image();  imgs[3].src = "img/img22-2.gif"; 
imgs[4] = new Image();  imgs[4].src = "img/img23-2.gif"; 
imgs[5] = new Image();  imgs[5].src = "img/a03-106.gif"; 
imgs[6] = new Image();  imgs[6].src = "img/a03-107.gif"; 
imgs[7] = new Image();  imgs[7].src = "img/a03-108.gif"; 
imgs[8] = new Image();  imgs[8].src = "img/a03-108.gif"; 
imgs[9] = new Image();  imgs[9].src = "img/img28-2.gif"; 
}

function chgimg(id, imgname) {
 if(document.images) {
  if(imgs[imgname]) {
    document.images[id].src = imgs[imgname].src;
  }
  else {
    document.images[id].src = imgname;
  }
 }
}