<html><head> <style> div { width:60px; height:60px; margin:5px; float:left; border:2px white solid; } </style> <script type="text/javascript" src="/jquery/jquery.js"></script></head><body> <div></div> <div class="middle"></div> <div class="middle"></div> <div class="middle"></div> <div class="middle"></div> <div></div><script> $("div").css("background", "#c8ebcc") .filter(".middle") .css("border-color", "red");</script></body></html>