function styleStringify(obj) {
  var key;
  var keyCount = 0;
  var i = 0;
  var str = '';
  for (key in obj) {
    keyCount++;
  }
  for (key in obj) {
    str += key + ': ' + obj[key];
    if (i < keyCount - 1) {
      str += '; ';
    }
    i++;
  }
  return str;
}
Convert an object into an attribute string