Twitter Bootstrap Tab navigation width and height justification plugin.

tab-justify.js

var $ = jQuery.noConflict();

function justifyTabs(){
    var count = $('.nav-tabs > li > a').length, // set how many tabs
        allHeights = []; // create array holder for the heights of our tabs
    $('.nav-tabs > li').each(function () {
        $(this).css('width', 100 / count + '%'); // set WIDTH based on how many tabs we have
        var itemHeight = $(this).outerHeight(); // get HEIGHT of this item
        allHeights.push(itemHeight); // add item HEIGHT to array
    });
    var tallestTab = Math.max.apply(null, allHeights); // get the tallest item HEIGHT
    $('.nav-tabs > li > a').each(function () {
        var pad = parseInt($(this).css('padding-top')), // get our default padding (from top, bottom should be same)
            itemHeight = $(this).closest('li').outerHeight(), // get HEIGHT of this item
            newPad = ((tallestTab - itemHeight) / 2) + pad; // set calculated padding to variable
        $(this).css({ 'padding-top' : newPad, 'padding-bottom' : newPad }); // give item appropiated padding
    });
}

// better to wait for everything
$(window).load(function () {
  justifyTabs();
});