Splash pages (those annoying pages with some sort of fancy graphic or flash intro that say "Click to Enter" or "Skip Intro") are bad. I could spend a whole article trying to convince you of this fact, but I think this article does a better job of it than I could ever do.
One of the most common mistakes made by Joomla! designers is to assume that just because you loaded Joomla! in a directory called "http://www.yourdomain.com/joomla" or "http://www.yourdomain.com/cms" or "http://www.yourdomain.com/home" rather than your root web directory, you are stuck needing to create a splash or intro page in your root directory to point your users to the real site. Nothing could be futher from the truth. As a webmaster, you have a couple of options for pointing users to your content without the need for a splash page. I will try to cover those options in this tutorial.
Option 1: Move Your Installation
In my opinion, this is the best option. Why would you not want to move your installation if you root directory is just pointing to a subdirectory? Simply move your Joomla! installation from your subdirectory to your root directory. This is a relatively simple process, which I will cover here.
Step 1: Move all of your files to your root web directory.
Move the files from /path/to/your/web/root/subdirectory to /path/to/your/web/root. There are a number of ways to do this, but it is a pretty straight-forward process using an FTP client application. If you need further explanation, please don't hesitate to ask.
Step 2: Modify your Joomla! 'configuration.php' File.
You will need to modify some variables in your 'configuration.php' file. Here is a list of the settings you need to change:
Option 2: Change your Server Settings to Make the Subdirectory the New Web Root Directory
This is the second-best option, but it is probably not available to you if you are using shared hosting. Also, I only recommend it for advanced users or network administrators. I will not take time in this article to explain how to do it, but just know that this is an option if you have root access to your server.
Option 3: Automatic Redirect With .htaccess
I do not recommend this option, but if you have no other choice for reasons outside of your control, then use a .htaccess file to automatically redirect visitors to your subdirectory. Here is a link to a site that explains how to do this.
Let's Sum it All Up
Splash pages are bad. Moving your Joomla! installation to your root web directory is good.