利用条件注释制作下拉菜单

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<li><a class="drop" href="../menu/index.html">DEMOS
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  <li><a href="http://www.webjx.com/htmldata/menu/zero_dollars.html" title="The zero dollar ads page">zero dollars advertising page</a></li>
  <li><a href="http://www.webjx.com/htmldata/menu/embed.html" title="Wrapping text around images">wrapping text around images</a></li>
  <li><a href="http://www.webjx.com/htmldata/menu/form.html" title="Styling forms">styled form</a></li>
  <li><a href="http://www.webjx.com/htmldata/menu/nodots.html" title="Removing active/focus borders">active focus</a></li>
  <li><a class="drop" href="http://www.webjx.com/htmldata/menu/hover_click.html" title="Hover/click with no active/focus borders">hover/click with no borders</li>
  <li class="upone"><a href="http://www.webjx.com/htmldata/menu/shadow_boxing.html" title="Multi-position drop shadow">shadow boxing</a></li>
  <li><a href="http://www.webjx.com/htmldata/menu/old_master.html" title="Image Map for detailed information">image map for detailed information</a></li>
  <li><a href="http://www.webjx.com/htmldata/menu/bodies.html" title="fun with background images">fun with background images</a></li>
  <li><a href="http://www.webjx.com/htmldata/menu/fade_scroll.html" title="fade-out scrolling">fade scrolling</a></li>
  <li><a href="http://www.webjx.com/htmldata/menu/em_images.html" title="em size images compared">em image sizes compared</a></li>
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