oElement.focus() not working in FCKeditor!!!

Hi,

I am trying to set focus to some elements in my editing area, but the focus() doesn't work. Could someone help please?

Here's my code - (I already have the focus set at the top of the editor window, before calling the following function).

function setFocus(elementId){
var oEditor = FCKeditorAPI.GetInstance('MyFCKeditor') ;
var oDOM = oEditor.EditorDocument ;
var oElement = oDOM.getElementById(elementId);
oElement.focus();
}

Thanks in advance!!!
Anna