/**
 * set bg-colors when toggling elements
 */

function adaptElementBG(element, elems2fadeout)
{
  var elem = document.getElementById(element);

  elem.className = 'right_box_upper_active';
  // additional handling: n to fade out, 1 to fade in
  if( elems2fadeout )
  {
    for( i = 0; i < elems2fadeout.length; i++ )
    {
      var elem2fadeout = document.getElementById(elems2fadeout[i]);
      elem2fadeout.className = 'right_box_upper_inactive';
    }
  }
}