// JavaScript Document
function setFooter() {
  if (document.getElementById) {
    var gaucheHeight = $('#gauche').offsetHeight;
    var droiteHeight = $('#droite').offsetHeight;
    var centreHeight = $('#centre').offsetHeight;
    var colHeight = Math.max(gaucheHeight, droiteHeight);
    var maxHeight = Math.max(colHeight, centreHeight);
    $('#centre').css('height', maxHeight + 'px');
  }
}