Header 

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />

  <title>Website</title>
  <link rel="shortcut icon" href="/favicon.ico" />

  <!--[if IE]>
    <link rel="stylesheet" href="/css/banner.css" type="text/css" />
  <![endif]-->
  <!--[if IE 7]>
  <link href="/css/site_styleIE7.css" rel="stylesheet" type="text/css" />
  <![endif]-->

  <link rel="stylesheet" href="/css/site_style.css" type="text/css" />
  <link rel="stylesheet" href="/css/banner.css" type="text/css" />

  <link href="/css/site_styleIE7.css" rel="stylesheet" type="text/css" />
  <link rel="stylesheet" href="/css/print.css" media="print" type="text/css" />

  <script src="/js/prototype.js" type="text/javascript"></script>
  <script src="/js/scriptaculous.js" type="text/javascript"></script>
  <script src="/js/lowpro.js" type="text/javascript"></script>
  <script src="/js/application.js" type="text/javascript"></script>

  <script type='text/javascript' 
        src='http://getfirebug.com/releases/lite/1.2/firebug-lite-compressed.js'></script>

</head>

Method in Firebug Lite console (internet explorer) 

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>>> $$('a').first().setStyle( { "border" : "solid 1px red" })
Error: Object doesn't support this property or method

Method in Firebug Lite console (firefox) 

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>>> $$('a').first().setStyle( { "border" : "solid 1px red" })
<a href="/index.php" style="border: 1px solid red;">