html Guest Gear

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htmls guest gear (all pages that look like this http://htmlgear.tripod.com/guest/control.guest?a=sign) has an exploit 
where you can inject html and javascript into there guestbook by doing the following 

<br iframe src=javascript:alert("hi")>></br>

you can put any html or javascript in there. you can find vunrable page by doing the following google search 

site:http://htmlgear.tripod.com/guest/control.guest?a=sign