Guestbook 1.5 jump menu not working :(

The jump menu for navigating between pages within the Guestbook 1.5 isn't working. Any one have any ideas? Cheers

Error:

"A Runtime Error
Line 53
Error: Object Expected" (in IE, nothing in Mozilla)

Guestbook is here:

http://www.ifrider.com/book/guestbook.html

From the perls script:

# name of guestbook files
$book_file = "guestbook.html";
$id_count = "guest_id.txt";
$page_count = "page_id.txt";
$sample = "template.html";

# name of thread pages -> guest-1.html, guest-2.html, etc.
$sub_page = "guest-";

# this variable is used to find the jump menu
$jump_menu = "<option value=\"guestbook.html\" selected>Guestbook</option>";

# image files
$arrow_img = "point.gif"; # if not in same dir with guestbook.html
$mail_img = "mail.gif"; # specify correct url for each file
$url_img = "url.gif";