How to add related post widget for blogger

<!--Related Posts with thumbnails Scripts and Styles Start--> <b:if cond='data:blog.pageType == &quot;item&quot;'> <style type='text/css'> #related-posts{float:left;width:auto;} #related-posts a{border-right: 1px dotted #eaeaea;} #related-posts a:hover{background: #EEEEEE;} #related-posts h2{margin-top: 10px;background:none;font:18px Oswald;padding:3px;color:#999999; text-transform:uppercase;} #related-posts .related_img {margin:5px;border:2px solid #f2f2f2;width:110px;height:100px;transition:all 300ms ease-in-out;-webkit-transition:all 300ms ease-in-out;-moz-transition:all 300ms ease-in-out;-o-transition:all 300ms ease-in-out;-ms-transition:all 300ms ease-in-out;-webkit-border-radius: 5px;  -moz-border-radius: 5px; border-radius: 5px; } #related-title {color:#666;text-align:center;padding: 0px 5px 10px;font-size:12px;width:110px; height: 40px;} #related-posts .related_img:hover{border:2px solid #E8E8E8;opacity:.7;filter:alpha(opacity=70);-moz-opacity:.7;-khtml-opacity:.7}</style> <script type='text/javascript' src='http://helplogger.googlecode.com/svn/trunk/relatedposts.js' /> </b:if> <!--Related Posts with thumbnails Scripts and Styles End-->