<?$f = file('your_list.txt');srand((double)microtime()*10 00000);$num = rand(0,count($f)-1);$url = $f[$num];header("Location: $url");?>
Save as php file example list.php
Put each url in a text file - one url per line - call it something like your_list - save as .txt file
Your url would look like
http://www.your_domain.com/list.php