//画像データ----------------------------------------------------------------------------------------------
var imglist = new Array(
          "img/pict_main1.jpg",
          "img/pict_main1b.jpg",
          "img/pict_main1c.jpg",
		  "img/pict_main1d.jpg",
		  "img/pict_main1e.jpg" );
       var selectnum = Math.floor((Math.random() * 100)) % imglist.length;
       var output = "<img src=" + imglist[selectnum] + ">";
       document.write(output);