I've take the liberty of moving your thread from the DB2 forum to the Oracle forum. There's a lot better chance of getting useful answers if the question is posed in the proper place.
What I think that you are requesting is an ER Diagram
. If that is what you want, there are a number of ways to provide it via your web site.
Because you are doing a commercial project, I'd recommend commercial tools to do the job so that you get the support and features that you will probably need.
I'm pretty comfortable saying that the "400 kilogram Gorilla" in the ER modeling space is still ERWin
which is currently marketed by Computer Associates. This is the be-all and end-all tool for data modeling in my mind, meaning that if any tool can do a task, ERWin can do it and can usually do it faster/easier/better than any other tool I've seen.
With that being said, there are plenty of other tools that are probably adequate for your needs. Visio
is one of the most useful. Visio is part of Microsoft's Visual Studio and also available as a separate product. Several of the Visio editions include the ability to both forward and reverse engineer ER diagrams from a database (including Oracle). Note that if you have Visual Studio Enterprise Architect or above, you already have Visio!