I understand. I do now HTML and CSS and have played a bit with javascript. But yes, I a am aware how difficult and time consuming this will be.
Would you then recommend RoR over PHP?
If your web application is mostly a web site with some dynamic features sprinkled in, then PHP would be a good choice because it's easy to embed straight within the HTML. If you're building a full-fledged web app (lots of dynamic content, database-backed, user accounts, etc.) then I would choose a web framework. I don't know how PHP web frameworks compare with Ruby web frameworks since I haven't used a PHP web framework myself.