1. Login to Blogger dashboard, select your blog, go to layout and add a new gadget
2. Select HTML/Java script for adding the gadget and paste the below code in it
<style>
/*
ColorBox Core Style:
The following CSS is consistent between example themes and should not be altered.
*/
#colorbox, #cboxOverlay, #cboxWrapper{position:absolute; top:0; left:0; z-index:9999; overflow:hidden;}
#cboxOverlay{position:fixed; width:100%; height:100%;}
#cboxMiddleLeft, #cboxBottomLeft{clear:left;}
#cboxContent{position:relative;}
#cboxLoadedContent{overflow:auto;}
#cboxTitle{margin:0;}
#cboxLoadingOverlay, #cboxLoadingGraphic{position:absolute; top:0; left:0; width:100%;}
#cboxPrevious, #cboxNext, #cboxClose, #cboxSlideshow{cursor:pointer;}
.cboxPhoto{float:left; margin:auto; border:0; display:block;}
.cboxIframe{width:100%; height:100%; display:block; border:0;}
/*
User Style:
Change the following styles to modify the appearance of ColorBox. They are
ordered & tabbed in a way that represents the nesting of the generated HTML.
*/
#cboxOverlay{background:#000;opacity:0.5 !important;}
#colorbox{
box-shadow:0 0 15px rgba(0,0,0,0.4);
-moz-box-shadow:0 0 15px rgba(0,0,0,0.4);
-webkit-box-shadow:0 0 15px rgba(0,0,0,0.4);
}
#cboxTopLeft{width:14px; height:14px;
background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgR2YS5TMzPW4LNGggJmP4WguMQ3dICq-CGVxy4It4TikO8T4GvIyE-lzkVdlwKHZgz7D1y8mcPbZMZ-SjzCsl92_7SzXwqTUrhjK-7aXhGBMbf_jDtr0JZA1R_tfhY2fjA_nwd-eiqYVQZ/h120/controls.png)
no-repeat 0 0;}
#cboxTopCenter{height:14px;
background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi7fnd0k3zgPSRH2ja7PCjqrn_6POgQS_t7V1fAgDzuBxbgdkwNkFyyEF-3CKxsyyAW8SLIpQoDfVdMyENP2SPWQSw5fVOUkpnwHXjFeuEZuRQbP9ObhJgBGvkqyinSPtgIeEAY3a6Fq2Q/h120/border.png)
repeat-x top left;}
#cboxTopRight{width:14px; height:14px;
background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgR2YS5TMzPW4LNGggJmP4WguMQ3dICq-CGVxy4It4TikO8T4GvIyE-lzkVdlwKHZgz7D1y8mcPbZMZ-SjzCsl92_7SzXwqTUrhjK-7aXhGBMbf_jDtr0JZA1R_tfhY2fjA_nwd-eiqYVQZ/h120/controls.png)
no-repeat -36px 0;}
#cboxBottomLeft{width:14px; height:43px;
background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgR2YS5TMzPW4LNGggJmP4WguMQ3dICq-CGVxy4It4TikO8T4GvIyE-lzkVdlwKHZgz7D1y8mcPbZMZ-SjzCsl92_7SzXwqTUrhjK-7aXhGBMbf_jDtr0JZA1R_tfhY2fjA_nwd-eiqYVQZ/h120/controls.png)
no-repeat 0 -32px;}
#cboxBottomCenter{height:43px;
background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi7fnd0k3zgPSRH2ja7PCjqrn_6POgQS_t7V1fAgDzuBxbgdkwNkFyyEF-3CKxsyyAW8SLIpQoDfVdMyENP2SPWQSw5fVOUkpnwHXjFeuEZuRQbP9ObhJgBGvkqyinSPtgIeEAY3a6Fq2Q/h120/border.png)
repeat-x bottom left;}
#cboxBottomRight{width:14px; height:43px;
background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgR2YS5TMzPW4LNGggJmP4WguMQ3dICq-CGVxy4It4TikO8T4GvIyE-lzkVdlwKHZgz7D1y8mcPbZMZ-SjzCsl92_7SzXwqTUrhjK-7aXhGBMbf_jDtr0JZA1R_tfhY2fjA_nwd-eiqYVQZ/h120/controls.png)
no-repeat -36px -32px;}
#cboxMiddleLeft{width:14px;
background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgR2YS5TMzPW4LNGggJmP4WguMQ3dICq-CGVxy4It4TikO8T4GvIyE-lzkVdlwKHZgz7D1y8mcPbZMZ-SjzCsl92_7SzXwqTUrhjK-7aXhGBMbf_jDtr0JZA1R_tfhY2fjA_nwd-eiqYVQZ/h120/controls.png)
repeat-y -175px 0;}
#cboxMiddleRight{width:14px;
background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgR2YS5TMzPW4LNGggJmP4WguMQ3dICq-CGVxy4It4TikO8T4GvIyE-lzkVdlwKHZgz7D1y8mcPbZMZ-SjzCsl92_7SzXwqTUrhjK-7aXhGBMbf_jDtr0JZA1R_tfhY2fjA_nwd-eiqYVQZ/h120/controls.png)
repeat-y -211px 0;}
#cboxContent{background:#fff; overflow:visible;}
#cboxLoadedContent{margin-bottom:5px;}
#cboxLoadingOverlay{background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjZ1S2W_9Q7gOnnGd4I0qW7LLR6eYxty78Mk8X5lS969H-eoPYHbQQcyTK6LqsxWWKBroBNfkSLZ57QGZAUgVxYD878A1wf8_Dis1VfSGz2qwE8lBl2bG65J2Urw1oDcRtPBvhY6FQ7wIY/h120/loading-background.png)
no-repeat center center;}
#cboxLoadingGraphic{background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjMU6vuylm0dvod4MbwNrKaO5w7UGkuFVNUt-bkVRWIBeRTkafl2vUTER9irnxa3CDy9BbZOE3sKBBCSx45qWUz14FyiM7uXYEms3qjXOfzecInVPcgr9yALm-iYNsBJzX9u-ItxTxP-N9M/h120/loading.gif)
no-repeat center center;}
#cboxTitle{position:absolute; bottom:-25px; left:0; text-align:center; width:100%; font-weight:bold; color:#7C7C7C;}
#cboxCurrent{position:absolute; bottom:-25px; left:58px; font-weight:bold; color:#7C7C7C;}
#cboxPrevious, #cboxNext, #cboxClose, #cboxSlideshow{position:absolute;
bottom:-29px;
background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgR2YS5TMzPW4LNGggJmP4WguMQ3dICq-CGVxy4It4TikO8T4GvIyE-lzkVdlwKHZgz7D1y8mcPbZMZ-SjzCsl92_7SzXwqTUrhjK-7aXhGBMbf_jDtr0JZA1R_tfhY2fjA_nwd-eiqYVQZ/h120/controls.pngno-repeat 0px 0px; width:23px; height:23px; text-indent:-9999px;}
#cboxPrevious{left:0px; background-position: -51px -25px;}
#cboxPrevious.hover{background-position:-51px 0px;}
#cboxNext{left:27px; background-position:-75px -25px;}
#cboxNext.hover{background-position:-75px 0px;}
#cboxClose{right:0; background-position:-100px -25px;}
#cboxClose.hover{background-position:-100px 0px;}
.cboxSlideshow_on #cboxSlideshow{background-position:-125px 0px; right:27px;}
.cboxSlideshow_on #cboxSlideshow.hover{background-position:-150px 0px;}
.cboxSlideshow_off #cboxSlideshow{background-position:-150px -25px; right:27px;}
.cboxSlideshow_off #cboxSlideshow.hover{background-position:-125px 0px;}
/*-----------------------------------------------------------------------------------*/
/* Facebook Likebox popup For Blogger
/*-----------------------------------------------------------------------------------*/
#subscribe {
font: 12px/1.2 Arial,Helvetica,san-serif; color:#666;
}
#subscribe a,
#subscribe a:hover,
#subscribe a:visited {
text-decoration:none;
}
.box-title {
color: #3B5998;
font-size: 20px !important;
font-weight: bold;
margin: 10px 0;
border:1px solid #ddd;
-moz-border-radius:6px;
-webkit-border-radius:6px;
border-radius:6px;
box-shadow: 5px 5px 5px #CCCCCC;
padding:10px;
line-height:25px; font-family:arial !important;
}
.box-tagline {
color: #999;
margin: 0;
text-align: center;
}
#subs-container {
padding: 35px 0 30px 0;
position: relative;
}
a:link, a:visited {
border:none;
}
.demo {
display:none;
}
</style>
<script src='http://ajax.googleapis.com/ajax/libs/jquery/1.5/jquery.min.js'></script>
<script src="http://supportivehandsjs.googlecode.com/files/jquery.colorbox-min.js"></script>
<script type="text/javascript">
jQuery(document).ready(function(){
if (document.cookie.indexOf('visited=true') == -1) {
var fifteenDays = 1000*60*60*24*30;
var expires = new Date((new Date()).valueOf() + fifteenDays);
document.cookie = "visited=true;expires=" + expires.toUTCString();
$.colorbox({width:"400px", inline:true, href:"#subscribe"});
}
});
</script>
<!-- This contains the hidden content for inline calls -->
<div style='display:none'>
<div id='subscribe' style='padding:10px; background:#fff;'>
<h3 class="box-title" align="center">Receive all updates via Facebook. Just Click
the Like Button Below<p style="line-height:3px;"
>▼</p></center></h3>
<center>
<iframe src="//www.facebook.com/plugins/likebox.php?href=http%3A%2F%2Fwww.facebook.com%2F
itcongress&width=350&colorscheme=light&show_faces=true&border_color=%23ffffff&stream=false&header=false&height=330"
scrolling="no" frameborder="0" style="border:none; overflow:hidden;
width:350px; height:330px;" allowtransparency="true"></iframe>
</center>
</div>
</div>
3. Change the blue highlighted text with your Facebook page username and then save your gadget
4. Save the arrangement and then visit your blog. You will see Facebook Like Box popping-up on it!!!