autosave not after refresh in ie

another question for you:)

does anybody know something about the editor and refreshing?

var wie = FCKeditorAPI.GetInstance('21') ;
if (wie.IsDirty()){
var cont = wie.GetHTML();
wie.ResetIsDirty();
window.setTimeout("parent.schrijfopt('content', '"+cont+"', '21')", 50);
}

thats what i use for an autosave XMLHTTPRequest. works fine, in ff but in ie it only before i refreshed the page.
So it works only with a clean ie window.
is fckeditor leaving some variables behind or whatever?