function randomize_banner() {
  document.write("<table width=\"700\" border=\"0\" cellspacing=\"0\" cellpadding=\"0\" class=\"sponsors\" summary=\"sponsors\">");


  var array_random = new Array();
  var array_logo= new Array();
  array_logo[0]="<td><a href=\"http://www.cisco.com/jp/\" target=\"_blank\"><img src=\"images/logos/cisco.gif\" alt=\"Cisco Systems, Inc.\" width=\"67\" height=\"36\" border=\"0\"></a></td>";
  array_logo[1]="<td><a href=\"http://www.fractalist.jp/\" target=\"_blank\"><img src=\"images/logos/fractalist.gif\" alt=\"Fractalist Inc.\" width=\"58\" height=\"36\" border=\"0\"></a></td>";
  array_logo[2]="<td><a href=\"http://www.fusioncom.co.jp/english/\" target=\"_blank\"><img src=\"images/logos/fusion.gif\" alt=\"Fusion Communications Corporation\" width=\"67\" height=\"38\" border=\"0\"></a></td>";
  array_logo[3]="<td><a href=\"http://www.japan-telecom.co.jp/english/\" target=\"_blank\"><img src=\"images/logos/jt_sbb.gif\" alt=\"Japan Telecom Co., Ltd. SoftBank BB Corp.\" width=\"120\" height=\"43\" border=\"0\"></a></td>";
  array_logo[4]="<td><a href=\"http://www.kddi.com/english/\" target=\"_blank\"><img src=\"images/logos/kddi.gif\" alt=\"KDDI Corporation\" width=\"68\" height=\"22\" border=\"0\"></a></td>";
  array_logo[5]="<td><a href=\"http://www.mind.co.jp/index_e.html\" target=\"_blank\"><img src=\"images/logos/mind.gif\" alt=\"Mitsubishi Electric Information Network Corporation\" width=\"72\" height=\"28\" border=\"0\"></a></td>";
  array_logo[6]="<td><a href=\"http://www.mri.co.jp/E/\" target=\"_blank\"><img src=\"images/logos/mri.gif\" alt=\"Mitsubishi Research Institute, Inc.\" width=\"50\" height=\"22\" border=\"0\"></a></td>";
  array_logo[7]="<td><a href=\"http://www.netmarks.co.jp/english/\" target=\"_blank\"><img src=\"images/logos/netmarks.gif\" alt=\"Netmarks Inc.\" width=\"57\" height=\"41\" border=\"0\"></a></td>";
  array_logo[8]="<td><a href=\"http://www.ntt.co.jp/index_e.html\" target=\"_blank\"><img src=\"images/logos/ntt.gif\" alt=\"Nippon Telegraph and Telephone Corporation\" width=\"72\" height=\"26\" border=\"0\"></a></td>";
  array_logo[9]="<td><a href=\"http://www.ntt-east.co.jp/index_e.html\" target=\"_blank\"><img src=\"images/logos/ntteast.gif\" alt=\"Nippon Telegraph and Telephone East Corporation\" width=\"59\" height=\"26\" border=\"0\"></a></td>";
  array_logo[10]="<td><a href=\"http://www.ntt-west.co.jp/index_e.html\" target=\"_blank\"><img src=\"images/logos/nttwest.gif\" alt=\"Nippon Telegraph and Telephone West Corporation\" width=\"59\" height=\"26\" border=\"0\"></a></td>";
  array_logo[11]="<td><a href=\"http://www.ntt-at.com/\" target=\"_blank\"><img src=\"images/logos/nttat.gif\" alt=\"NTT Advanced Technology Corporation\" width=\"96\" height=\"26\" border=\"0\"></a></td>";
  array_logo[12]="<td><a href=\"http://www.oki.com/\" target=\"_blank\"><img src=\"images/logos/oki.gif\" alt=\"Oki Electric Industry Co., Ltd.\" width=\"68\" height=\"19\" border=\"0\"></a></td>";
  array_logo[13]="<td><a href=\"http://www.softfront.co.jp/en/\" target=\"_blank\"><img src=\"images/logos/softfront.gif\" alt=\"Softfront\" width=\"111\" height=\"23\" border=\"0\"></a></td>";
  array_logo[14]="<td><a href=\"http://www.sw.nec.co.jp/english/\" target=\"_blank\"><img src=\"images/logos/nec.gif\" alt=\"NEC Corporation\" width=\"71\" height=\"19\" border=\"0\"></a></td>";
  array_logo[15]="<td><a href=\"http://www.ntt.com/index-e.html\" target=\"_blank\"><img src=\"images/logos/nttcom.gif\" alt=\"NTT Communications Corporation\" width=\"111\" height=\"27\" border=\"0\"></a></td>";
  array_logo[16]="<td><a href=\"http://www.radvision.com/\" target=\"_blank\"><img src=\"images/logos/radvision.gif\" alt=\"RADVISION\" width=\"110\" height=\"20\" border=\"0\"></a></td>";
  i=0;
  do{ 
    var a=get_random();
    var b=0;
    if(!i){
      array_random[i]=a;
    }else{
      for(j=0;j<array_random.length;j++){
        if(array_random[j]==a){
          b=1;
        }
      }
     if(!b){
       array_random[array_random.length]=a;
     }
    }
    i++;
  }while(array_random.length<=16)
  for(i=0;i<array_logo.length;i++){
  	if(i==0 || i==5 || i==10 || i==15){
		document.write("<tr>");
	}
    document.write(array_logo[array_random[i]]);
  	if(i==4 || i==9 || i==14){
		document.write("</tr>");
	}
  }
  document.write("<td><img src=\"images/logos/spaser.gif\" alt=\"\" width=\"1\" height=\"1\" border=\"0\"></a></td>");
  document.write("<td><img src=\"images/logos/spaser.gif\" alt=\"\" width=\"1\" height=\"1\" border=\"0\"></a></td>");
  document.write("<td><img src=\"images/logos/spaser.gif\" alt=\"\" width=\"1\" height=\"1\" border=\"0\"></a></td>");
  document.write("</tr>");
    document.write("</table>");
}

function get_random() {
  var r=17 * Math.random();
	if(r){
	  r = Math.ceil(r);
	}else{
      r=1;		
	}
	return (r-1);
}