phpで考えてみた

<?php
srand((double)microtime()* 1000000); /* 初期化 */
$board = array("板URL1","板URL2",…);
$board2 = array_rand($board,1);
$drift = $board[$board2];

print "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\" \"http://www.w3.org/TR/html4/loose.dtd\">";
print "<html>";
print "<head>";
print "<meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\">";
print "<title>漂流者発生装置</title>";
print "</head>";
print "<body>";
print "<center><a href=$drift>では、旅に出ようか</a></center>";
print "</body>";
print "</html>";
?>

こんな感じになるのかな。