function showimg1(){
  document.area1.src = "http://www.spu.ac.jp/img/spu/common/image/photo01.jpg";
  document.getElementById("area2").href = "http://www.spu.ac.jp/view.rbz?nd=218&ik=1&pnp=101&pnp=218&cd=877";
}

function showimg2(){
  document.area1.src = "http://www.spu.ac.jp/img/spu/common/image/photo02.jpg";
  document.getElementById("area2").href = "http://www.spu.ac.jp/view.rbz?nd=257&ik=1&pnp=226&pnp=257&cd=932";
}

function showimg3(){
  document.area1.src = "http://www.spu.ac.jp/img/spu/common/image/photo03.jpg";
  document.getElementById("area2").href = "http://www.spu.ac.jp/view.rbz?nd=257&ik=1&pnp=226&pnp=257&cd=912";
}

function showimg4(){
  document.area1.src = "http://www.spu.ac.jp/img/spu/common/image/photo04.jpg";
  document.getElementById("area2").href = "http://www.spu.ac.jp/view.rbz?nd=221&ik=1&pnp=100&pnp=221&cd=777";
}

function showimg5(){
  document.area1.src = "http://www.spu.ac.jp/img/spu/common/image/photo05.jpg";
  document.getElementById("area2").href = "http://www.spu.ac.jp/view.rbz?nd=286&ik=1&pnp=228&pnp=286&cd=1059";
}