Of course, the iPad is a pretty large screen and a fully capable browser, so most websites don’t need to have iPad specific versions of them. But if you need to, you can detect for it with .htaccess

RewriteCond %{HTTP_USER_AGENT} ^.*iPad.*$
RewriteRule ^(.*)$ http://ipad.yourdomain.com [R=301]

This will redirect iPad users to a URL you specify.