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okay, so your happy coding in css compliant world and then you remember … IE is not css compliant … but you’ve just written some code utilizing the "position: fixed;" property and value … you check IE 7 … all good … then IE 6 … rut roh raggy … enter conditional comments … yea it’s a wee bit hacky … but sometimes non compliant browsers require non compliant solutions … the trick here is the use of conditional comments to target the browser then use IE specific css properties and values like overflow-y (however css3 includes this property) and expression along with the so important !important declaration …

for example:

   1:  <!--[if lt IE 7]>

   2:  <style type="text/css">

   3:  body {

   4:      overflow: hidden;

   5:  }

   6:  #YOUR_MAIN_BODY_BLOCK_TAG {

   7:      height: expression(document.body.clientHeight + "px") !important;

   8:      overflow-y: scroll;

   9:      overflow-x: auto;

  10:  }

  11:  #YOUR_FIXED_BLOCK_TAG {

  12:      position: absolute !important;

  13:  }

  14:  </style>

  15:  <![endif]-->

also, ensure that #YOUR_FIXED_BLOCK_TAG is not a child tag of #YOUR_MAIN_BODY_BLOCK_TAG … they should be siblings …