Related Posts Widget For Blogger

The related posts widget will show a new related posts section below your post page.The related posts are fetched from the those posts having the same label as the current post.

To implement the related posts widget you will have to follow 2 simple replacement steps.

1.Login to your blogger account and get into your Dashboard

2.From there goto Template > Edit HTML and expand your widget templates(option on the right)

3.Now find this line of code

</head>

and replace it with

<b:if cond='data:blog.pageType == "item"'>
<style>
#related-posts {
float:center;
text-transform:none;
height:100%;
min-height:100%;
padding-top:5px;
padding-left:5px;
}
#related-posts .widget{
padding-left:6px;
margin-bottom:10px;

}
#related-posts .widget h2, #related-posts h2{
font-size: 1.6em;
font-weight: bold;
color: black;
font-family: Georgia, “Times New Roman”, Times, serif;
margin-bottom: 0.75em;
margin-top: 0em;
padding-top: 0em;
}
#related-posts a{
color:blue;
}
#related-posts a:hover{
color:blue;
}
#related-posts ul{
list-style-type:none;
margin:0 0 0px 0;
padding:0px;
text-decoration:bold;
font-size:15px;
text-color:#000000
}
#related-posts ul li{
background:transparent url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjZxYTVnIz2-iVzqaqDsEkdAC3HwHXVs-Fnkn8IUYPgmiMl-aVkOqEatflh2GTez8oRfKrdmXSA-5YK-XROO8oY5V55DG7tto-dicxufmgu1yi5fFicbJs-f3aM2pW9DWpSzF-t9vU-NvA/s200/greentickbullet.png) no-repeat ;
display:block;
list-style-type:none;
margin-bottom: 13px;
padding-left: 30px;
padding-top:0px;}
style>
<script type='text/javascript'>
var relatedpoststitle="Related Posts";
script>
<script src='http://blogergadgets.googlecode.com/files/related.js' type='text/javascript'/>
b:if>

head>

If you want to change the title of your widget you can edit this line of the above code 

var relatedpoststitle="Related Posts";

If you want you can edit the blue and black colors present in this code

4.Now find this line of code

<div class='post-footer-line post-footer-line-1'>

 If you cant find it then try finding this one

<p class='post-footer-line post-footer-line-1'>

 Now immediately after any of these lines(whichever you could find) place this code snippet

        <!-- Related Posts Code Start-->
        <b:if cond='data:blog.pageType == &quot;item&quot;'>
        <div id='related-posts'>
        <b:loop values='data:post.labels' var='label'>
        <b:if cond='data:label.isLast != &quot;true&quot;'>
        </b:if>
        <b:if cond='data:blog.pageType == &quot;item&quot;'>
        <script expr:src='&quot;/feeds/posts/default/-/&quot; + data:label.name + &quot;?alt=json-in-script&amp;callback=related_results_labels&amp;max-results=6&quot;' type='text/javascript'/></b:if></b:loop><a href='http://www.bloggerplugins.org/2009/08/related-posts-for-blogger-widget.html' style='display:none'>Related Posts Widget</a>
        <script type='text/javascript'>
        var currentposturl=&quot;<data:post.url/>&quot;;
        var maxresults=5;
        removeRelatedDuplicates(); printRelatedLabels();
        </script>
        </div>
        </b:if>
        <!-- Related Posts Code End-->

var maxresults=5;

this line determines the number of related posts that are displayed..and by default 6 posts are fetched from each label.
Now you should have a working related posts widget on your blog.If you want to customize the look and feel,then you can alter the CSS rules.
source : http://www.bloggerplugins.org/