var images = {
        // 画像とジャンプ先の URL のペア
        url : [
          ['../php/img/banner_ofef.gif', '../feature/ofef/index.html'],
          ['../php/img/banner_prefes.gif', '../feature/prefes/index.html'],
          ['../php/img/banner_parade.gif', '../feature/parade/index.html'],
		  ['../php/img/banner_enjiiro.gif', '../feature/enjiiro/index.html'],
          ['../php/img/banner_art.gif', '../feature/art/index.html'],
          ['../php/img/banner_acade.gif', '../feature/academic/index.html']
          ],
		
     // 順番のシャッフル
        shuffle : function() {
          for (i = this.url.length; i > 0; --i) {
            tmp = this.url[p = Math.floor(Math.random()*i)] ;
            this.url[p] = this.url[i-1] ;
            this.url[i-1] = tmp ; 
          }
        },		


        p : 0, // 表示画像のポインタ

        // 画像表示
        put : function() {
          document.write('<a href="'+this.url[this.p][1]+'"><img src="'+this.url[this.p++][0]+'" /></a>') ;
          if (this.p >= this.url.length) this.p = 0 ;
        }
      } ;

      images.shuffle() ;