Unwanted disabling buttons and right click

Hi to all.
For my web application I load fckeditor with some reports.

This is my procedure:

In the main.jsp I have

<body onload="javascript: start();">

where,

function start(){
editor.load();
setTimeout("setText()",1000);
}

function setText(){
var text;
text = document.forms[0].elements[hiddenText].value;
if (text != null && text != ""){
editor.setTextArea(text);
}
}

and "editor" is the id of a iframe:

<iframe id="editor" scrolling="no" src="EditorSist.html"></iframe>

Into EditorSist.html this is the "core"

function load(){
iFrameEditor = editor.frames[0].frames[0];
textArea = editor.frames[0].eSourceField;
}

function setTextArea(Text){
iFrameEditor.document.close();
iFrameEditor.document.open();
iFrameEditor.document.write(Text);
}

<iframe id="editor" src="FCK.jsp" scrolling="no"></iframe>

Finally, FCK.jsp contains

var sBasePath = 'FCKeditor/';
var oFCKeditor = new FCKeditor( 'FCKeditor1' ) ;
oFCKeditor.BasePath = sBasePath ;
oFCKeditor.Height = 455;
oFCKeditor.Create() ;

This is my procedure and it works correctly. In other words, the Main.jsp load the text into the editor BUT, some buttons as Cut/Copy/Undo doesn't enable themselves when I select a piece of text. Moreover, the right mouse button click over the tables, doesn't offer the relative table menu.
I add that if I create an empty document (without text loading), all works correctly.

Someone can help me?

Thanks in advance.