// Original code found on http://ex.paulhirsch.com/vertically-align-image/

function alignImages() {
  var divs = new Array();
  var imgs = new Array();
  divs = document.getElementsByTagName('div');
  imgs = document.getElementsByTagName('img');
  for (i=0 ; i<divs.length ; i++) {
    if (divs[i].className==='galleryImageContainer') {
      var divheight = divs[i].offsetHeight;
      var imgheight = divs[i].firstChild.offsetHeight;
      var margins = Math.floor((divheight-imgheight)/2);
      divs[i].firstChild.style.marginTop = margins + 'px';
      divs[i].firstChild.style.marginBottom = margins + 'px';
    }
  }
}
window.onload = alignImages;