Something

  <script type="javascript">
  	function sizeBox()
  	{
  		// Get viewport height.
  		// Stolen from http://www.quirksmode.org/viewport/compatibility.html
  		var x,y;
		var test1 = document.body.scrollHeight;
		var test2 = document.body.offsetHeight
		if (test1 > test2) // all but Explorer Mac
		{
			x = document.body.scrollWidth;
			y = document.body.scrollHeight;
		}
		else // Explorer Mac;
		     //would also work in Explorer 6 Strict, Mozilla and Safari
		{
			x = document.body.offsetWidth;
			y = document.body.offsetHeight;
		}
		
		var marginTop, marginBottom, h;
		
		// our margins in pixels
		marginTop = 15;
		marginBottom = 35;
		
		// The calculated height
		h = y - marginTop - marginBottom;
		
		alertbox('h');
		
		// Resize the div.
		document.getElementById("content-container").style.height = y;
  	}	
  </script>