function corporation_h1txt() {
var corporation_h1txt = new Array(
   '<p class="corporation-image"><img src="img/index_h1_001.jpg" alt="企業情報イメージ" width="529" height="156" /></p>',
   '<p class="corporation-image"><img src="img/index_h1_002.jpg" alt="企業情報イメージ" width="529" height="156" /></p>',
   '<p class="corporation-image"><img src="img/index_h1_003.jpg" alt="企業情報イメージ" width="529" height="156" /></p>'
	  );
   var selectnum = Math.floor((Math.random() * 100)) % corporation_h1txt.length;
   document.write(corporation_h1txt[selectnum]);
}