i'm having difficulty achieving this. any help would be appreciated. i would like the div content1 and content2 to fill up the remaining space vertically in a window with a set minimum height. it needs to adjust automatically with window resize. many thanks!

<style type="text/css">
html, body {
	height: 100%;
	background-color: #E1E1E1;
}
body, td, th {
	font-family: Arial, Helvetica, sans-serif;
	height: 100%;
}
</style>
<style type="text/css">
<!--
/* ~~ this fixed width container surrounds all other divs~~ */
.container {
	width: 965px;
	height: 100%;
	margin: 0 auto; /* the auto value on the sides, coupled with the width, centers the layout */
	overflow: hidden; /* this declaration makes the .container understand where the floated columns within ends and contain them */
}
 .sidebar1 {
 float: left;
 width: 200px;
 padding-bottom: 10px;
 min-height: 100%;
}
.content {
	padding: 10px 0;
	width: 380px;
	background: #fcfcfc;
	float: left;
	height: 100%;
	position: relative;
}
.content2 {
	float: left;
	width: 380px;
	background: #fcfcfc;
	padding: 10px 0;
}
/* ~~ This grouped selector gives the lists in the .content area space ~~ */
.content ul, .content ol {
	padding: 0 15px 15px 40px; /* this padding mirrors the right padding in the headings and paragraph rule above. Padding was placed on the bottom for space between other elements on the lists and on the left to create the indention. These may be adjusted as you wish. */
}
/* ~~ The footer styles ~~ */
.footer {
	padding: 10px 0;
	position: relative;/* this gives IE6 hasLayout to properly clear */
	clear: both; /* this clear property forces the .container to understand where the columns end and contain them */
}
/* ~~ Miscellaneous float/clear classes ~~ */
.fltrt {  /* this class can be used to float an element right in your page. The floated element must precede the element it should be next to on the page. */
	float: right;
	margin-left: 8px;
}
.fltlft { /* this class can be used to float an element left in your page. The floated element must precede the element it should be next to on the page. */
	float: left;
	margin-right: 8px;
}
.clearfloat { /* this class can be placed on a <br /> or empty div as the final element following the last floated div (within the .container) if the .footer is removed or taken out of the .container */
	clear:both;
	height:0;
	font-size: 1px;
	line-height: 0px;
}
-->
</style>
<link href="SpryAssets/SpryTabbedPanels.css" rel="stylesheet" type="text/css">
</head>
<body>
<div id="wrapper">
  <header>
    <div class="container_8 clearfix">
      <h1 class="grid_1"><img src="resources/img/kite2.png" width="35" height="16"></h1>
      <nav class="grid_5">
        <ul class="clearfix">
          <li class="fr"><a href="#">administrator<span class="arrow-down"></span></a>
            <ul>
              <li><a href="#">Account</a></li>
              <li><a href="#">Users</a></li>
              <li><a href="#">Groups</a></li>
              <li><a href="index.php">Sign out</a></li>
            </ul>
          </li>
        </ul>
      </nav>
      <form class="grid_2">
        <input class="full" type="text" placeholder="Search..." />
      </form>
    </div>
  </header>
  <section>
    <div class="container">
      <div class="sidebar1">
        <div style="padding-top: 5px;">
          <div id="TabbedPanels1" class="TabbedPanels">
            <ul class="TabbedPanelsTabGroup">
              <li class="TabbedPanelsTab" tabindex="0" style="border-right: 0px;"><img src="resources/img/tab1.png" alt=""></li>
              <li class="TabbedPanelsTab" tabindex="0"><img src="resources/img/tab2.png"></li>
              <li class="TabbedPanelsTab" tabindex="0"><img src="resources/img/tab3.png"></li>
              <li class="TabbedPanelsTab" tabindex="0"><img src="resources/img/tab4.png"></li>
            </ul>
            <div class="TabbedPanelsContentGroup">
              <div class="TabbedPanelsContent">Content 1</div>
              <div class="TabbedPanelsContent">Content 2</div>
              <div class="TabbedPanelsContent">Content 3</div>
              <div class="TabbedPanelsContent">Content 4</div>
            </div>
          </div>
        </div>
      </div>
      <div class="content" style="border-left: solid 1px #CCC;"><!-- end .content --></div>
      <div class="content2" style="border-left: solid 1px #CCC;"><!-- end .sidebar2 --></div>
      <!-- end .container --> 
    </div>
  </section>
</div>

i dunno the only thing i saw was you are missing a height: 100%; in your content2 css

I don't think that it would be perfectly possible in <div>, although by using css intelligently, this objective can be achieved up to some extent. I suggest you to create that section in <table> and doing this would be just a piece of cake.

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