Ajax on the Textarea Field, wont work

Hello,

i used a simple jquery autosave function on some Fields in my HTML Form (not on the hole form).
All "normal" Textfields work fine except the Textfield i use with ckeditor. It seem that the "original" field do not store the text from cke, till the hole form is submited.
Is there a workaround to prevent this? I use the latest cke with FF8 Chrome15.

Thanks for help

Christian