var imglist = [
						[ "images/linkimg1.gif", "", "http://www.npi.co.jp/english/portfolio/01_25.html" ] ,
						[ "images/linkimg2.gif", "", "http://www.npi.co.jp/english/portfolio/01_24.html" ] ,
						[ "images/linkimg3.gif", "", "http://www.npi.co.jp/english/portfolio/01_23.html" ] ,
						[ "images/linkimg4.gif", "", "http://www.npi.co.jp/english/portfolio/01_22.html" ] ,
						[ "images/linkimg5.gif", "", "http://www.npi.co.jp/english/portfolio/02_03.html" ] ,
						[ "images/linkimg6.gif", "", "http://www.npi.co.jp/english/portfolio/02_02.html" ] ,
						[ "images/linkimg7.gif", "", "http://www.npi.co.jp/english/portfolio/01_19.html" ] ,
						[ "images/linkimg8.gif", "", "http://www.npi.co.jp/english/portfolio/01_16.html" ] ,
						[ "images/linkimg9.gif", "", "http://www.npi.co.jp/english/portfolio/01_15.html" ] ,
						[ "images/linkimg10.gif", "", "http://www.npi.co.jp/english/portfolio/01_13.html" ] ,
						[ "images/linkimg11.gif", "", "http://www.npi.co.jp/english/portfolio/02.html" ] ,
						[ "images/linkimg12.gif", "", "http://www.npi.co.jp/english/portfolio/02.html" ] ,
      [ "images/linkimg13.gif", "", "http://www.npi.co.jp/english/portfolio/02_01.html" ] 
   ];


   function RandomImageLink() {

      var selectnum = Math.floor(Math.random() * imglist.length);

      var output =
         '<a href="' + imglist[selectnum][2] + '">' +
         '<img src="' + imglist[selectnum][0] + '"' +
         ' alt="' + imglist[selectnum][1] + '" border="0"></a>';

      document.write(output);
   }