function resize()
{

  var theWidth, theHeight;
  // Window dimensions:
  if (window.innerWidth) {
  theWidth=window.innerWidth;
  }
  else if (document.documentElement && document.documentElement.clientWidth) {
  theWidth=document.documentElement.clientWidth;
  }
  else if (document.body) {
  theWidth=document.body.clientWidth;
  }
  if (window.innerHeight) {
  theHeight=window.innerHeight;
  }
  else if (document.documentElement && document.documentElement.clientHeight) {
  theHeight=document.documentElement.clientHeight;
  }
  else if (document.body) {
  theHeight=document.body.clientHeight;
  }

  var second_column = document.getElementById("second_column");
  second_column.offsetHeight;

  var side_nav = document.getElementById("side_navigation");
  side_nav.offsetHeight;

  if(document.getElementById('blue'))
  {
    if(second_column.offsetHeight > side_nav.offsetHeight)
    document.getElementById('blue').style.height=second_column.offsetHeight-side_nav.offsetHeight-1 + 'px';
    else
    document.getElementById('blue').style.display="none";
  }
}