I’m trying to build a screen like this:

How can I split my cell in several rows and a column, without disformat my other table components?
I already started, but when I split my cell, my table disformat.
http://jsfiddle.net/KMjm6/
Take another example, without the use of html table: http://jsfiddle.net/Gh6mB/8/
If could understand your question
DEMO: http://jsfiddle.net/KMjm6/4/
Put a table inside the middle cell and create your affect