Easy fix to php script

My html practice board at <[login to view URL]> needs a small fix. It works the way it should except for one small problem. When the button to show html is clicked, all the text entered in the textarea is cleared. I need this text to remain so users can edit the code. Also, when users click on the link that's generated, they need to see the code in the textarea along with the output at the bottom of the page. View <[login to view URL]> to see how it should work. See attached file ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform unix, php, mysql