$.ready()

$(document).ready(function(){

... 

    var totalCount = <%=totalCount%>;
  //$("#buttonDisplay").attr("style","none");
  var downloads = $("input[name^='downloadButtonId']");
  console.log(downloads);
  $.each(downloads,function(a,b){
   b.style.display = "none";
   b.disabled = true;
   console.log(b.name);
  });

 

...
});