1.The first thing you should do is have your future skins ready. For now though, they are stil layouts. (don't forget to code them!)
Make sure each layout is set up like it would be with the PHP includes, a header and a footer.

2.Copy/paste the following information onto a blank new page:

<? $total_skins = #; $default_skin = #; if (isset($_REQUEST['newskin'])) { $newskin=(int)$_REQUEST['newskin']; if ( ($newskin<1) OR ($newskin>$total_skins) ) $newskin=$default_skin; } elseif (isset($_REQUEST['skin'])) { $newskin=(int)$skin; if ( ($skin<1) OR ($skin>$total_skins) ) $newskin=$default_skin; } else $newskin=$default_skin; $skin=$newskin; setcookie ('skin', "", time() - 3600); setcookie('skin',$newskin,time()+(86400*365),'/'); setcookie('skin',$newskin,time()+(86400*365),'/','.YOURDOMAIN.COM'); $skin=$newskin; $headervar = "/home/USER/public_html/skins/$newskin/header"; $footervar = "/home/USER/public_html/skins/$newskin/footer"; $ex/tension = ".php"; ?>
See where it says $total_skins = #; $default_skin = #;?
The $total_skins = #; is the number of skins and $default_skin = #; is the number of the skin that visitors will see upon entering your site.
The line that says ,'/','.YOURDOMAIN.COM'); is where you add your url. For instance, for AG I would add animegraphx.com, or if I have a subdomain sub.animegraphx.com.
Save this file as cookiecheck.php.

3.Once again, open up a blank page and enter the following:

<?php include ("/home/USERNAME/public_html/skins/cookiecheck.php");?>
If you have a domain, change USERNAME to the one you signed up with. If you are on a subdomain, ask your host what it is.
Your coding would look a bit different. It would have to be
<?php include ("/home/USERNAME/public_html/SUBDOMAIN/skins/cookiecheck.php");?>

4.After you pasted that in, start on a new line right after that and just paste this:

<? include($headervar.$extension); ?>
Once you got that done, save this file as header.php.

5.Make another page, and paste the following in:

<? include($footervar.$extension); ?>
Save this file as footer.php.

6.Connect to your FTP, and make a new folder called skins. Upload the file we made earlier, cookiecheck.php. Now, depending on how many layouts you made you make that many folders inside. For instance, if I have three skins, I would make three folders called 1, 2, 3, etc..

7.Upload all the images and header/footer.php in the three folders (supposing you have three layouts, four if you have four layouts etc..).
Now, whenever you want to link to a certain skin add the following code:

<a href="http://yourdomain.com/index.php?newskin=#">Skin #</a>

That's pretty much it, I hope you have fun with your skins! If there are any questions, youu can always ask at the boards!