The guest book is there, but the page never stops loading. My guess is that it isn't the guest book code that is the problem, but I'm not going to make a serious attempt at finding out. Your source code is full of meaningless stuff that appears to have been pasted in from some attempt at making a web page in Word (of all things!), and half a dozen references to your hard disk.
Somewhere in there is probably the reason for your problem.
