This is a problem i face all the time. When post count of a thread is too high it is split into pages (Page 1, Page 2, ....). So if a user, when replying, want to see the previous post he must have to navigate to that specific page..
Is there any way to solve this problem.
I have a idea. If i am wrong please let me know..
Make the reply box floating with auto-hide option and list all posts of the current thread 1 by 1.
So user can easily scroll to any portion of the thread and when need just use the reply-box and reply....