How to get actual content written by user in this Rich Text Editor ?

How to get actual content written by user in this Rich Text Editor ?

Hi,
I am using this Rich Text Editor in my asp.net page.Every thing is fine , but i want to get the html contents inserted by user using a javaScript function and submit the form asynchronously.
But i am unable to get the html content.Please help ,how to get the html contents.I am herewith attaching that Rich Text Editor file .You please unzip these files and place those in a single folder, i have kept in separate folders since single file size was getting larger that limit.

Thanks