Guestbook 1.5 jump menu not working please help

i installed guestbook 1.5 .... everything is working fine but the jump menu is not working. the script generating the pages (ex. guest-1.html, guest-2.html) and the no of the pages (ex. 1-3) but when i select "1-3" and press go it doesnt work. i checked the "guestbook.html", its been modified

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<select name="menu">
<option value="guestbook.html" selected>Guestbook</option>
<option value="http://www.mysite.com/cgi-bin/book/guest-1.html">1-3</option>
</select>
<input type="button" value="Go" onclick="JumpTo(this.form)">
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and the guest-1.html also modified as above but the go button is not working, although i can go to "http://www.mysite.com/cgi-bin/book/guest-1.html" manually to see the first 3 posts.

the guestbook.pl is unchanged for the jump menu.....

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# 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>";
-----------------------------------------

i coundnot find out the mistake. the guestbook is perfect for me but the problem with jump menu. Please help.

thanks in advance

problem solved.... the problem was with the jump menu of java script.

thanks for the great script.... this is the best.

If you like 1.5 You will love 2.3.1

yes i know. i have seen the 2.3.1, lot better but the sad part is i dont have mysql for my site