gistfile1.txt

$(document).ready(function () {
  IT.EvenWidths(".header-wrap nav > ul:first", ".header-wrap nav > ul:first > li");
  IT.EvenWidths(".list ul", ".list li");
  IT.Navigation(".header-wrap nav");
}); 


IT.EvenWidths = function(parentSelector, childSelector) {

  var $parent = $(parentSelector);
  var parentWidth = $parent.width();
  var $child = $(childSelector);
  var totalWidthOfChildren = 0;
  var padding = 0;

  $child.each(function(i) {
    totalWidthOfChildren += $(this).outerWidth();
    var $c = $child.eq(i);
    padding += (parseInt($c.css('padding-right')));
    padding += (parseInt($c.css('padding-left')));
  });

  var remainingSpace = parentWidth - totalWidthOfChildren;
  var remainingSpaceSplit = Math.round(remainingSpace / $child.length);
  var recalculatedWidth = padding;

  $child.each(function(i) {
    var linkJq = $(this).find("a:first");
    var origWidth = parseInt(linkJq.width());
    linkJq.width(origWidth + remainingSpaceSplit);
    recalculatedWidth += (origWidth + remainingSpaceSplit);
    if (recalculatedWidth > parentWidth) {
      linkJq.css('width', origWidth + remainingSpaceSplit - (recalculatedWidth - parentWidth));
    }
  });

}