USA Mike wrote:
and my javascript function :

function TEST_BOX1_AJOUT()
{   
alert(document.FORMU_BOX.CH_NEW1.value);   // first problem ! the value is not what i update; it stays the first init value 'here you go' in my exampl }

I assume that by using document.FORMU_BOX.CH_NEW1.value you are trying to retrieve the value of the editor? You can try using the editor javascript API instead to retrieve the value of the editor.

function TEST_BOX1_AJOUT() {
      var oEditor = FCKeditorAPI.GetInstance('CH_NEW1');
      alert(oEditor.GetXHTML(true));
}

Refer to the JavaScript API section in the developer guide for more info.