set document.location.href without causing the viewport to scroll

gistfile1.js

var set_document_hash = function(hash) {
  var id = hash,
      temp_id = "TEMP-" + hash,
      target = $("#" + id);

  if (target.length) target.attr("id", temp_id);
  document.location.hash = hash;
  if (target.length) target.attr("id", id);
}