<script>
(function() {
var randomId = Math.floor(Math.random() * 100000);
var targetElemId = 'bcom_rwidget_' + randomId;
document.write('<div id="' + targetElemId + '"></div>');
var script   = document.createElement('script');
script.type  = 'text/javascript';
script.async = true;
script.src   = 'http://www.booking.com/review_widget/gr/olympia-house.en.html?tmpl=review_widget/review_widget&wid=' + targetElemId + '&wtype=box_big&hotel_id=421085&widget_language=xu';
var node     = document.getElementsByTagName('script')[0];
node.parentNode.insertBefore(script, node);
}());
</script>