FCKeditor inside a javascript form.

Hi.
I have a forum that need a inline reply container.
I can use this with a regular form and send text the normal way.
But i need to replace the textarea with fck area.
How do i do this.

The form is making a "div" container visible.
Here is the code from php page.

Here is the code with regular form.

    function vis_svar(id, smil, snor_id, gruppe_id) {
       var e = document.getElementById(id);
       var f = document.getElementById(smil);
       if(e.style.display == 'block')
      {
          e.style.display = 'none';
          f.style.display = 'none';
      }
       else
      {
         e.style.display = 'block';
         f.style.display = 'block';
      }
    // form elements
    parentElement = document.getElementById(id)
    parentElement.innerHTML = ""
    
    // Create form
    myForm = document.createElement('FORM')
    myForm.method = 'post'
    myForm.action = 'forum_post.php?' + snor_id +'&'+ gruppe_id
    myForm.setAttribute('Name', 'save_post')
    myForm.id = 'save_post'
    

    // Create text area
    textArea = document.createElement('TEXTAREA')
    textArea.appendChild(document.createTextNode(''))
    textArea.setAttribute('Name', 'PostText')
    textArea.setAttribute('ID', 'PostText')
    textArea.style.display = 'block'
    textArea.style.width = '500px'
    textArea.style.height = '150px'
        myForm.appendChild(textArea)
   
    // Create submit button
    newButton = document.createElement('INPUT')
    newButton.type = 'submit'
    newButton.setAttribute('Name', 'save_post')
    newButton.value = 'Send posten'
    newButton.style.display = 'block'
    myForm.appendChild(newButton)
    
    // insert form
    parentElement.appendChild(myForm)
    
    // IE fix
    if(navigator.appVersion.indexOf("MSIE") != -1) {

        parentElement.innerHTML = parentElement.innerHTML

        if(navigator.appVersion.indexOf("MSIE 6.0") != -1) {
            multiOptions = document.getElementById('myDropDownMulti').options
            for(i=0; i<multiOptions.length; i++) {
                if(i==1 || i==3) { multiOptions[i].setAttribute('selected', 'true') }
            }
        }
    }
}