Responsive Horizontal Scrolling Menu

Question

http://healthunit.com has a clean horizontal scrolling menu at the top of the screen once you view it from a mobile phone device. I'm trying to mimic that same exact functionality thanks to a site I'm redesigning with a huge level of navigation elements.

Requirements:

1. Left and right scroll click options
2. Centered list item option centered in the space
3. Only one list item visible at a time
4. Horizontal Scrolling & Responsive
5. Clicking the last or first option in the list will take you to either the first option or last option in the list

My current html for this section is:

<nav id="sub" class="clearfix">
  <ul class="wrapper">
    <a href="#"><li>Estimate</li></a>
    <a href="#"><li>About</li></a>
    <a href="#"><li>Customer Information</li></a>
    <a href="#"><li>Financing</li></a>
    <a href="#"><li>Careers</li></a>
    <a href="#"><li>Locate Us</li></a>
    <a href="#"><li>Inspiration</li></a>
  </ul>
</nav>

The CSS currently attached to it is:

nav#sub {
  background: #004173;
  background: linear-gradient(to bottom, #004173 0%,#014f8d 100%);
  background: -moz-linear-gradient(top, #004173 0%, #014f8d 100%);
  background: -ms-linear-gradient(top, #004173 0%,#014f8d 100%);
  background: -o-linear-gradient(top, #004173 0%,#014f8d 100%);
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#004173), color-stop(100%,#014f8d));
  background: -webkit-linear-gradient(top, #004173 0%,#014f8d 100%);
  border-bottom: #00325a solid 3px;
  box-shadow: 0 4px 6px 0 #BFBFBF;
  filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#004173', endColorstr='#014f8d',GradientType=0 );
  webkit-box-shadow: 0 4px 6px 0 #BFBFBF;
}

#sub ul {
  text-align: center;
}

#sub ul li {
  padding: 10px 3.3%;
}

#sub a {
  color: #fff;
  font-size: 10pt;
  font-weight: 400;
  text-decoration: none;
}

#sub ul a:hover li {
  background: #007FEB;
}

Answer 1

So, finally I think I have what you are looking for:

Fiddle: http://jsfiddle.net/fzXMg/2/

CSS and HTML is in the Fiddle...

JS:

$(function(){
    var state = 0;
    var maxState = 6;
    var winWidth = $(window).width();
    $(window).resize(function(){
        winWidth = $(window).width();
        $('.box,.container_element').width(winWidth-100);
    }).trigger('resize');
    $('#lefty').click(function(){
        if (state==0) {
           state = maxState;
        } else {
           state--;
        }
        $('.container_element').animate({scrollLeft:((winWidth-100)*state)+'px'}, 800);
    });
    $('#righty').click(function(){
        if (state==maxState) {
           state = 0;
        } else {
           state++;
        }
        $('.container_element').animate({scrollLeft:((winWidth-100)*state)+'px'}, 800);
    });
});

This uses jQuery again.