Руководство jQuery

    $("div:visible").click(function () {
      $(this).css("background", "yellow");
    });
    $("button").click(function () {
      $("div:hidden").show("fast");
    });

"HTML"

<button>Show hidden to see they don't change</button>
  <div></div>
  <div class="starthidden"></div>
  <div></div>
  <div></div>
  <div style="display:none;"></div>

"CSS"

  div { width:50px; height:40px; margin:5px; border:3px outset green; float:left; }
  .starthidden { display:none; }

"Живой пример jQuery"

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
						"http://www.w3.org/TR/html4/loose.dtd">
	<html>
	<head>
	<link href="http://test-drupal.ru/themes/slyweb/css/jqueryiframe.css" 
	rel="stylesheet" type="text/css"/>
	  <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.5.0/jquery.min.js"></script>
	<script>
	  $(document).ready(function(){
	
    $("div:visible").click(function () {
      $(this).css("background", "yellow");
    });
    $("button").click(function () {
      $("div:hidden").show("fast");
    });


	  });
	</script>

	</head>
	<body class="iframe">

	
<button>Show hidden to see they don't change</button>
  <div></div>
  <div class="starthidden"></div>
  <div></div>
  <div></div>
  <div style="display:none;"></div>



	</body>
	</html>

	
	<style>
	
  div { width:50px; height:40px; margin:5px; border:3px outset green; float:left; }
  .starthidden { display:none; }

	</style>

Метод появился в jQuery 1.0 (http://api.jquery.com/visible/)

Версия jQuery 1.4.2 Документ создан 2010-08-21