How to get inner and outer width to a single element?

Tags: jquery,css,width

Problem :

Is there a way in CSS or jQuery to get inner and outer width to a single element?
I have a div that has a width of 100% and a height of 30px, and inside this div i have a navigation menu list (two unordered lists). I want to get inner width of 960px to this div so that the menu will be centered and the background of the div will have a width:100% because the div has a width of 100%.

example: Inner and outer width

I don't want to add any other div inside or outside this div. I want do all this with this single div. How can i accomplish this?

Any help is greatly appreciated! Thank you so much!

Solution :

What about something like this?

border:1px solid red;/* for fiddle visualization*/}

position: relative;   

div ul:first-of-type{
background-color:#00f;/* for fiddle visualization*/
left: 50%;
margin-left: -430px; 
float: left;
div ul:nth-of-type(2){
background-color:#0f0;/* for fiddle visualization*/
right: 50%;
margin-right: -430px; 
float: right;


here is a fiddle:

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