How to validate the FCK Editor content using Javascript

var oEditor = FCKeditorAPI.GetInstance('Body');
var oDOM = oEditor.EditorDocument;
var strFCKEditorText = "";
if (document.all)// If I.E.
{
strFCKEditorText = oDOM.body.innerText;
}
else
{
var r = oDOM.createRange();
r.selectNodeContents(oDOM.body);
strFCKEditorText = r.toString();
}