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/* JavaScript Code Snippets to make sidebar color extend to the bottom of the page

This function is courtsey of http://www.sitepoint.com/newsletter/viewissue.php?id=3&issue=70#4
It adjusts the height of the columns so they are identical. That way the background goes all the way
to the bottom of the column
It has been adjusted for two columns from the original three
It uses the X JavaScript library, see additional routines */
/************************************************************************************************************************/

// xGetElementById r2, Copyright 2001-2007 Michael Foster (Cross-Browser.com)
// Part of X, a Cross-Browser Javascript Library, Distributed under the terms of the GNU LGPL

function xGetElementById(e) {
  if(typeof(e)=='string') {
    if(document.getElementById) e=document.getElementById(e);
    else if(document.all) e=document.all[e];
    else e=null;
  }
  return e;
}

// xNum r2, Copyright 2001-2007 Michael Foster (Cross-Browser.com)
// Part of X, a Cross-Browser Javascript Library, Distributed under the terms of the GNU LGPL

function xNum() {
  for(var i=0; i<arguments.length; ++i){if(isNaN(arguments[i]) || typeof(arguments[i])!='number') return false;}
  return true;
}

// xDef r1, Copyright 2001-2007 Michael Foster (Cross-Browser.com)
// Part of X, a Cross-Browser Javascript Library, Distributed under the terms of the GNU LGPL

function xDef() {
  for(var i=0; i<arguments.length; ++i){if(typeof(arguments[i])=='undefined') return false;}
  return true;
}

// xStr r1, Copyright 2001-2007 Michael Foster (Cross-Browser.com)
// Part of X, a Cross-Browser Javascript Library, Distributed under the terms of the GNU LGPL

function xStr(s) {
  for(var i=0; i<arguments.length; ++i){if(typeof(arguments[i])!='string') return false;}
  return true;
}

// xCamelize r1, Copyright 2007 Michael Foster (Cross-Browser.com)
// Part of X, a Cross-Browser Javascript Library, Distributed under the terms of the GNU LGPL

function xCamelize(cssPropStr)
{
  var i, c, a = cssPropStr.split('-');
  var s = a[0];
  for (i=1; i<a.length; ++i) {
    c = a[i].charAt(0);
    s += a[i].replace(c, c.toUpperCase());
  }
  return s;
}
// xGetComputedStyle r7, Copyright 2002-2007 Michael Foster (Cross-Browser.com)
// Part of X, a Cross-Browser Javascript Library, Distributed under the terms of the GNU LGPL

function xGetComputedStyle(e, p, i) {
  if(!(e=xGetElementById(e))) return null;
  var s, v = 'undefined', dv = document.defaultView;		
  if(dv && dv.getComputedStyle){
    s = dv.getComputedStyle(e,'');
    if (s) v = s.getPropertyValue(p);
  }
  else if(e.currentStyle) {
    v = e.currentStyle[xCamelize(p)];
  }
  else return null;
  return i ? (parseInt(v) || 0) : v;
}

// xHeight r6, Copyright 2001-2007 Michael Foster (Cross-Browser.com)
// Part of X, a Cross-Browser Javascript Library, Distributed under the terms of the GNU LGPL

function xHeight(e,h) {	
  var s = e;
  if(!(e=xGetElementById(e))) return 0;
  if (xNum(h)) {
    if (h<0) h = 0;
    else h=Math.round(h);
  }
  else h=-1;
  var css=xDef(e.style);
  if (e == document || e.tagName.toLowerCase() == 'html' || e.tagName.toLowerCase() == 'body') {
    h = xClientHeight();
  }
  else if(css && xDef(e.offsetHeight) && xStr(e.style.height)) {
   if(h>=0) {
      var pt=0,pb=0,bt=0,bb=0;
      if (document.compatMode=='CSS1Compat') {
        var gcs = xGetComputedStyle;		
        pt=gcs(e,'padding-top',1);		  
        if (pt !== null) {
          pb=gcs(e,'padding-bottom',1);
          bt=gcs(e,'border-top-width',1);
          bb=gcs(e,'border-bottom-width',1);
        }
        // Should we try this as a last resort?
        // At this point getComputedStyle and currentStyle do not exist.
        else if(xDef(e.offsetHeight,e.style.height)){ 			
          e.style.height=h+'px';
          pt=e.offsetHeight-h;			
        }
      }
      h-=(pt+pb+bt+bb);
      if(isNaN(h)||h<0) return;
	   	  else e.style.height=h+'px';
    }
    h=e.offsetHeight;
  }
  else if(css && xDef(e.style.pixelHeight)) {			
    if(h>=0) e.style.pixelHeight=h;
    h=e.style.pixelHeight;
  }
  return h;
}

function adjustLayout() {
// Get natural heights
  var cHeight = xHeight("content");
  var lHeight = xHeight("leftColumn1");

  // Find the maximum height
  var maxHeight =
    Math.max(cHeight, lHeight);

  // Assign maximum height to all columns
  xHeight("content", maxHeight);
  xHeight("leftColumn1", maxHeight);
}

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