how to make the nav as horizontal?

how to make the nav as horizontal?

Greeting ,

how to make the nav as horizontal? i have this code please reply me
<style type="text/css">
    .tab-nav {
      width: 610px;
      overflow: hidden;
      background: #ddd url(tab-slide.png) no-repeat 0 0;
    }
  
    .tab-nav ul {
      position: relative;
      float: left;
      width: 1600px;
      margin-left: 535px;
      padding-left: 0;
      list-style-type: none;
      background-color: #fff;
    }
    .tab-nav li {
      float: left;
      clear: left;
    }

    .tab-nav a {
      display: block;
      width: 74px;
      border-right: 1px solid #ddd;
      height: 25px;
      line-height: 24px;
      float: left;
      text-align: center;
      text-decoration: none;
      color: #000;
      background:  url(tab-slide.png) no-repeat 2px -194px;
    }
    .tab-nav a.expanded {
      background-position: 2px -244px;
    }
</style>

<div id="tab-nav" class="tab-nav">
      <ul>
        <li>
          <a href="#">one</a>
          <ul>
            <li><a href="#">sub one</a></li>
            <li><a href="#">sub two</a></li>
            <li><a href="#">sub three</a></li>
          </ul>
        </li>
        <li>
          <a href="#">two</a>
          <ul>
            <li><a href="#">b sub one</a></li>
            <li><a href="#">b sub two</a></li>

            <li><a href="#">b sub three</a></li>
            <li><a href="#">b sub four</a></li>
            <li><a href="#">b sub five</a></li>
          </ul>
        </li>
        <li>
          <a href="#">three</a>

          <ul>
            <li><a href="#">sub one</a></li>
            <li><a href="#">sub two</a></li>
            <li><a href="#">sub three</a></li>
          </ul>
        </li>
      </ul>

    </div>

$(document).ready(function() {
  $('#tab-nav-1 > ul > li > a').click(function() {
    var $parentItem = $(this).parent(),
        slideAmt = $(this).next().width(),
        direction;

    if (parseInt($parentItem.css('marginLeft'), 10) < 0) {
      direction = '+=';
      $(this).removeClass('expanded');
    } else {
      $(this).addClass('expanded');
      direction = '-=';
    }
    $parentItem
      .animate({marginLeft: direction + slideAmt}, 400);
    return false;
  });
 
});

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