var b_max = 8;  
var b_image = new Array(
	// NO 1
	'<a href="http://www.vinas.com/jp/en/" target="_blank"><img src="banner/vinas2.gif" width="138" height="38" border="0"></a>',
	// NO 2
	'<a href="http://www.osakavacuum.co.jp/english/index.html" target="_blank"><img src="banner/osaka_vacuum.gif" width="138" height="38" border="0"></a>',
	// NO 3
	'<a href="http://www.cre-nagoya.com" target="_blank"><img src="banner/cre.gif" width="138" height="38" border="0"></a>',
	// NO 4
	'<a href="http://www.sorun.co.jp/" target="_blank"><img src="banner/sorun.gif" width="138" height="38" border="0"></a>',
	// NO 5
	'<a href="http://www.nippi.co.jp" target="_blank"><img src="banner/nippi.gif" width="138" height="38" border="0"></a>',
	// NO 6
	'<a href="http://www.besttechjp.com/en/about%20us.htm" target="_blank"><img src="banner/best-tech.gif" width="138" height="38" border="0"></a>',
	// NO 7
	'<a href="http://www.editage.com/" target="_blank"><img src="banner/editage.gif" width="138" height="38" border="0"></a>',
	// NO 8
	'<a href="http://www.tokupi.co.jp/" target="_blank"><img src="banner/tokupi.gif" width="138" height="38" border="0"></a>',
	// end
	''  // for error
);

function wrt_banner(){
  var arrayLen = b_image.length - 2;               
  var num = Math.floor(Math.random() * arrayLen);  

  document.write("<table border=\"0\" align=\"center\" cellpadding=\"2\" cellspacing=\"0\">");
  for (i = 0; i < b_max; i++) {
	  document.write("<tr>");
    document.write("<td>", b_image[num], "</td>");
    if (num != arrayLen) {
      num++;
    } else {
      num = 0;
    }
	  document.write("</tr>");
  }
  document.write("</table>");
}

wrt_banner();
