Incorporating web designer's into a rails app

I have a designer who has great knowledge of HTML, CSS and JavaScript (Not jQuery or AJAX though).

He gives me his designs in those files and I have to incorporate it into my apps.

The site is not static so I have trouble incorporating it.

When the site was static I used to save the HTMLs in my app/views directory and the other CSS, JS, fonts in the public/... dir. The files are directly linked from the HTML is read just fine.

But now, I have to replace HTML tags with .erb ones <% --rails-- %> when some dynamic action needs to be performed. Even this seems harder than it sounds

Anyone developer experienced with this? How did you solve your problem?

OR should I ditch this designer and get a designer who has good knowledge of rails?