<!-- Put this script tag to the <head> of your page -->
<script type="text/javascript" src="http://userapi.com/js/api/openapi.js?32"></script>

<script type="text/javascript">
  VK.init({apiId: 2378844, onlyWidgets: true});
</script>

<!-- Put this div tag to the place, where the Like block will be -->
<div id="vk_like"></div>
<script type="text/javascript">
VK.Widgets.Like("vk_like", {type: "mini"});
</script>