function reverseString(s) {
    var sout = '';
    var len = s.length;
    for(var i = 0; i < len; i++)  {
      sout = s.charAt(i) + sout;
      }
    return sout;
   }

  function mailScramble()  {
    var mailElement = document.getElementById("pg4Mailto");
    var subject = '?subject="Progenitor 4 Prototype"';
    var target = "mailto:" + reverseString('moc.sesirpretne-eniltserc' + '@' + 'rotinegorp') + subject;
    mailElement.setAttribute("href", target);
    }

 var bannerElem;
 var bannerHeight;

 function resetPage()  {
   var docHeight = document.getElementById('main').clientHeight;
   var bannerSpace = Math.ceil((docHeight - bannerHeight)/2);
   if (bannerSpace > 40)  {
      var bannerTop = bannerSpace + 'px';
      bannerElem.style.top = bannerTop;
      }
   }  

 function pageSetup()  {
   mailScramble();
   bannerElem = document.getElementById('banner');
   bannerHeight = bannerElem.clientHeight;
   resetPage();
   }

 window.onload = pageSetup;
 window.onresize=resetPage;