Constantly IE6 and/or IE7 behave as pain the the a** when you develop web-applications or websites. But you can target your CSS and/or JavaScript for these browsers using just a few lines of simple code:

<!--[if lt IE 7]>
  <link rel="stylesheet" type="text/css" media="screen" href="ie6.css" />
<![endif]-->

In this case we only check if the user's browser version is less than IE/, eg. IE6 or IE5 or IE5.5. Here are a couple of variants:

<!--[if IE 6]>
  <link rel="stylesheet" type="text/css" media="screen" href="ie6.css" />
<![endif]-->

It targets ONLY IE version 6.

<!--[if IE 5]>
  <link rel="stylesheet" type="text/css" media="screen" href="ie5.css" />
<![endif]-->

This only targets IE version 5. So the "lt" in the top example stands for "less than" (NOT "less than or equal). For a video tutorial of this, please refer to detatcheddesign.com.