Cómo agregar botón de Google +1 sin plugins dudosos

<div class="widget-container">			<div class="google-box">				<!-- Google +1 script -->
				<script type="text/javascript">
				  (function() {
					var po = document.createElement('script'); po.type = 'text/javascript'; po.async = true;
					po.src = 'https://apis.google.com/js/plusone.js';
					var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(po, s);
				  })();
				</script>
				<!-- Link blog to Google+ page -->
				<a style='display: block; height: 0;' href="https://plus.google.com/u/0/+AdrianCavero" rel="publisher">&nbsp;</a>
				<!-- Google +1 Page badge -->
				<g:plus href="[B]https://plus.google.com/u/0/+AdrianCavero[/B]" height="131" width="280" theme="light"></g:plus>


			</div>


<!-- Place this tag where you want the +1 button to render. -->
<div class="g-plusone"></div>


<!-- Place this tag after the last +1 button tag. -->
<script type="text/javascript">
  window.___gcfg = {lang: 'es-419'};


  (function() {
    var po = document.createElement('script'); po.type = 'text/javascript'; po.async = true;
    po.src = 'https://apis.google.com/js/plusone.js';
    var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(po, s);
  })();
</script>