Integrating CKE in to php

Hello.

I have a fully php generated website. Even text areras are generated using php in a file called form.php
I just came back from TinyMCE which is very easy to integrate, but is also very buggy . It also inserts paragraphs instead of br's when pressing enter, which is contrary to normal user behaviour on the web.
But I have no clue how to insert the javascript for CKE in my website.
I know that the textarea names are "bericht". I tried it myself, but then my entire page disappears.

function form_textarea($name, $value, $preview=""){ 
    if($preview <> ""){ 
             
        echo ' 
        <script type="text/javascript"> 
            function to_preview_bericht_ajax(){ 
                var value = document.getElementById(\''.$name.'\').value; 
                preview_bericht_ajax(value); 
            } 
        </script> 
                 
        '; 
        $preview = 'onkeyup="preview_bericht()" onchange="to_preview_bericht_ajax()"';
     } 
    $form = '<textarea class="text" name="'.$name.'" id="'.$name.'" COLS="50" ROWS="10" '.$preview.'>'.$value.'</textarea>';
     return $form;