window.onload = function (){
   var wheight = 0;
   if(typeof(window.innerWidth) == 'number'){
      wheight = window.innerHeight;
   }else if(document.documentElement && document.documentElement.clientHeight){
      wheight = document.documentElement.clientHeight;
   }else if(document.body && document.body.clientHeight){
      myHeight = document.body.clientHeight;
   }
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      var newmargin = Math.round((wheight-389)/2);
      if(newmargin > 0){
         document.getElementById('tag-portfolio').style.marginTop = newmargin + 'px';
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}