Renewal of a very small website using jQuery

A very small website, nearly a one pager, needs a renewal. A small php scripts counts the words and characters entered into a textfield and outputs the result. After the renewal the Page needs to look modern and the output of the result should be realized using jQuery (AJAX) on the same page. Shorter texts beeing entered into the textfield schould be analyzed in real time (real time output of the word and char count, see this site to get the idea: [login to view URL]). If the user posts a very long text in the textfiled, real time analysing might be a performance killer, therefore analysing should start after hitting a button. The few texts on the site are in German language and should more or less stay there for SEO reasons. Just included into the modern design. The overall content should be centered. No left alignment anymore. The textfield schould be compact (but more than a line) in the beginning and self expanding if more text is being entered.