As always I have kept the installation extremely easy. You just have to copy and paste the code below...
- Now go to Blogger Dashboard > Design.
- Add a Gadget > HTML/JavaScript.
- Paste below code after replacing my username with yours.
/*
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%; height: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:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiCuaEI-ygxc51nAPUKBBHRVvnG5CPypSBOWXcecKFOtbAJAeLYdrtbsHaXQ7AxaYngzFNTTG28FRIZP4f9KmcNHccGTeUqsIBAvJZJu8Fyzv_UYJTiGZgNGnYWQgCluQe_F7vph5IsMNZH/s1600/overlay.png) repeat 0 0;}
#colorbox{}
#cboxTopLeft{width:21px; height:21px; background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgYXwCHlgrhhRZtjwOd3AwUKDzSCg1eCOPU0546wn8hhliuM8fLDNyPms5mfMFAAn6CQI3SR5pMb5AcMAKEePKw3GJs6ZBJC-TtOSSTgbKVh_k2yxp7XTA3q-aQvu1fOO2BEcf53Me-Q_uF/s1600/controls.png) no-repeat -101px 0;}
#cboxTopRight{width:21px; height:21px; background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgYXwCHlgrhhRZtjwOd3AwUKDzSCg1eCOPU0546wn8hhliuM8fLDNyPms5mfMFAAn6CQI3SR5pMb5AcMAKEePKw3GJs6ZBJC-TtOSSTgbKVh_k2yxp7XTA3q-aQvu1fOO2BEcf53Me-Q_uF/s1600/controls.png) no-repeat -130px 0;}
#cboxBottomLeft{width:21px; height:21px; background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgYXwCHlgrhhRZtjwOd3AwUKDzSCg1eCOPU0546wn8hhliuM8fLDNyPms5mfMFAAn6CQI3SR5pMb5AcMAKEePKw3GJs6ZBJC-TtOSSTgbKVh_k2yxp7XTA3q-aQvu1fOO2BEcf53Me-Q_uF/s1600/controls.png) no-repeat -101px -29px;}
#cboxBottomRight{width:21px; height:21px; background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgYXwCHlgrhhRZtjwOd3AwUKDzSCg1eCOPU0546wn8hhliuM8fLDNyPms5mfMFAAn6CQI3SR5pMb5AcMAKEePKw3GJs6ZBJC-TtOSSTgbKVh_k2yxp7XTA3q-aQvu1fOO2BEcf53Me-Q_uF/s1600/controls.png) no-repeat -130px -29px;}
#cboxMiddleLeft{width:21px; background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgYXwCHlgrhhRZtjwOd3AwUKDzSCg1eCOPU0546wn8hhliuM8fLDNyPms5mfMFAAn6CQI3SR5pMb5AcMAKEePKw3GJs6ZBJC-TtOSSTgbKVh_k2yxp7XTA3q-aQvu1fOO2BEcf53Me-Q_uF/s1600/controls.png) left top repeat-y;}
#cboxMiddleRight{width:21px; background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgYXwCHlgrhhRZtjwOd3AwUKDzSCg1eCOPU0546wn8hhliuM8fLDNyPms5mfMFAAn6CQI3SR5pMb5AcMAKEePKw3GJs6ZBJC-TtOSSTgbKVh_k2yxp7XTA3q-aQvu1fOO2BEcf53Me-Q_uF/s1600/controls.png) right top repeat-y;}
#cboxTopCenter{height:21px; background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjr54_FFhsYAj12VvxLjckjYubFT3ObZeYxQV0T9FJyCBo53Rj4PnYMnTCgtjoUDLS-lqPCl-WlENx6O77xJvWgYfjtg87ENGgm4aS69X7REu-YpmNqTnukaIgU6mg8Pj0adewPoSBHvHSQ/s1600/border.png) 0 0 repeat-x;}
#cboxBottomCenter{height:21px; background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjr54_FFhsYAj12VvxLjckjYubFT3ObZeYxQV0T9FJyCBo53Rj4PnYMnTCgtjoUDLS-lqPCl-WlENx6O77xJvWgYfjtg87ENGgm4aS69X7REu-YpmNqTnukaIgU6mg8Pj0adewPoSBHvHSQ/s1600/border.png) 0 -29px repeat-x;}
#cboxContent{background:#fff; overflow:hidden;}
.cboxIframe{background:#fff;}
#cboxError{padding:50px; border:1px solid #ccc;}
#cboxLoadedContent{margin-bottom:28px;}
#cboxTitle{position:absolute; bottom:4px; left:0; text-align:center; width:100%; color:#949494;}
#cboxCurrent{position:absolute; bottom:4px; left:58px; color:#949494;}
#cboxSlideshow{position:absolute; bottom:4px; right:30px; color:#0092ef;}
#cboxPrevious{position:absolute; bottom:0; left:0; background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgYXwCHlgrhhRZtjwOd3AwUKDzSCg1eCOPU0546wn8hhliuM8fLDNyPms5mfMFAAn6CQI3SR5pMb5AcMAKEePKw3GJs6ZBJC-TtOSSTgbKVh_k2yxp7XTA3q-aQvu1fOO2BEcf53Me-Q_uF/s1600/controls.png) no-repeat -75px 0; width:25px; height:25px; text-indent:-9999px;}
#cboxPrevious:hover{background-position:-75px -25px;}
#cboxNext{position:absolute; bottom:0; left:27px; background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgYXwCHlgrhhRZtjwOd3AwUKDzSCg1eCOPU0546wn8hhliuM8fLDNyPms5mfMFAAn6CQI3SR5pMb5AcMAKEePKw3GJs6ZBJC-TtOSSTgbKVh_k2yxp7XTA3q-aQvu1fOO2BEcf53Me-Q_uF/s1600/controls.png) no-repeat -50px 0; width:25px; height:25px; text-indent:-9999px;}
#cboxNext:hover{background-position:-50px -25px;}
#cboxLoadingOverlay{background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi9Kym6mjzYwLWe4xLTkz4QWEfsU8WZy_gP79sQCrjZGznDbbxMZ2NSfAuG2r84F5hKdrWCu1mG68EiQsB3FMH9TxChv3dipqon1pEwxGpQAc7PblozhJg2vUO8AKfgzgrNlWq__NF8xy8f/h120/loading.gif) no-repeat center center;}
#cboxLoadingGraphic{background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi9Kym6mjzYwLWe4xLTkz4QWEfsU8WZy_gP79sQCrjZGznDbbxMZ2NSfAuG2r84F5hKdrWCu1mG68EiQsB3FMH9TxChv3dipqon1pEwxGpQAc7PblozhJg2vUO8AKfgzgrNlWq__NF8xy8f/h120/loading.gif) no-repeat center center;}
#cboxClose{position:absolute; bottom:0; right:0; background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgYXwCHlgrhhRZtjwOd3AwUKDzSCg1eCOPU0546wn8hhliuM8fLDNyPms5mfMFAAn6CQI3SR5pMb5AcMAKEePKw3GJs6ZBJC-TtOSSTgbKVh_k2yxp7XTA3q-aQvu1fOO2BEcf53Me-Q_uF/s1600/controls.png) no-repeat -25px 0; width:25px; height:25px; text-indent:-9999px;}
#cboxClose:hover{background-position:-25px -25px;}
/*
The following fixes a problem where IE7 and IE8 replace a PNG's alpha transparency with a black fill
when an alpha filter (opacity change) is set on the element or ancestor element. This style is not applied to or needed in IE9.
See: http://jacklmoore.com/notes/ie-transparency-problems/
*/
.cboxIE #cboxTopLeft,
.cboxIE #cboxTopCenter,
.cboxIE #cboxTopRight,
.cboxIE #cboxBottomLeft,
.cboxIE #cboxBottomCenter,
.cboxIE #cboxBottomRight,
.cboxIE #cboxMiddleLeft,
.cboxIE #cboxMiddleRight {
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr=#00FFFFFF,endColorstr=#00FFFFFF);
}
/*
The following provides PNG transparency support for IE6
Feel free to remove this and the /ie6/ directory if you have dropped IE6 support.
*/
.cboxIE6 #cboxTopLeft{background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhan4gM0bn7bmvs77tmdzI1AV0sV8cBm-c9fEcHHRdDhBjo9uaQfil3wedP-xQcTwBNUqTfxtEMMpH6H-CiPMdMaFVB5Y3iIAF1u3q6oQS2MdfwlQPCabhVUMtwRMExuh7FAJgPUlWp5J9e/s1600/borderTopLeft.png);}
.cboxIE6 #cboxTopCenter{background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjMQwN0s0RxVdPRuJn787IHEK5qQN3MxwMp4HcZlK4rKYfljf8uvOGpIO8U_LYTwPze7BAePn4zwXYtjkEDsEXlvlpToLg5kUVuGTJfRPZNVDj-KTU0H-AL6kUtmvpsrg55G7TULemvIEU2/s1600/borderTopCenter.png);}
.cboxIE6 #cboxTopRight{background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiEHYpg7nGjuwmLX6rkNVXW1yT4HeWVa74Zq7x6ljAtseDsSLcNMbyb5GbDhtA6PIXYennYCC2JuSUMJDscbtW4EJ-2SFyANBhQYsWleN_Sn3ngy_QN5ptFTiaG3sUF6ZfRe5v1Ys-co3Yn/s1600/borderTopRight.png);}
.cboxIE6 #cboxBottomLeft{background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiEHYpg7nGjuwmLX6rkNVXW1yT4HeWVa74Zq7x6ljAtseDsSLcNMbyb5GbDhtA6PIXYennYCC2JuSUMJDscbtW4EJ-2SFyANBhQYsWleN_Sn3ngy_QN5ptFTiaG3sUF6ZfRe5v1Ys-co3Yn/s1600/borderTopRight.png);}
.cboxIE6 #cboxBottomCenter{background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgWJ38Qi7D8z2sQp8pHYwa42xj24zlB9bj0X0xoKLakvzsHMNJoIbQ1mQl_nYOpyC-3nwtwllp87wZbRBVIGDqlAJLRIxvfV9v4bFOHgOFewsOV2xG4HsJA2T7JfmEbDunf4e1lABER7nRb/s1600/borderBottomCenter.png);}
.cboxIE6 #cboxBottomRight{background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiIA6PNdBrm8l9of4W5vgSAu1GcjdkeTYcOdqV5qNAj0Qrcj2jvZMb9mKNvFSW6ydcCvK_lYHH3VMsYgqwXod8xzhSjxPdfOUFOspu9XetXQEd5ig0OkF84taIG9YfhyVO-5zLmElKt7mRu/s1600/borderBottomRight.png);}
.cboxIE6 #cboxMiddleLeft{background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjGjisumNa5iOWp9aACCvEecdZTjpLeQHJQap4110kt5nr3HaZfXkttqxN8ss0PQi7p7qZSomjjPuKs7LDyXwEtGIKzJm8B172B_nUcKHRX47aEHPL8xa-8GSaKZALyUvkUVAgGK4Ap5r9N/s1600/borderMiddleLeft.png);}
.cboxIE6 #cboxMiddleRight{background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiUvbwffSrtOvr-67_zcGYdKOcpLUPn3PoOK1OdDDDfexLiy2vayjqChO8DKSrlYvDj2o6qC0iIE71Lq_7ZVa0nkeYXM42uQrBfnSiAiXWbBrYrez_nnU-z8XC-VXusTlWHj8M2U8K7YBV-/s1600/borderMiddleRight.png);}
.cboxIE6 #cboxTopLeft,
.cboxIE6 #cboxTopCenter,
.cboxIE6 #cboxTopRight,
.cboxIE6 #cboxBottomLeft,
.cboxIE6 #cboxBottomCenter,
.cboxIE6 #cboxBottomRight,
.cboxIE6 #cboxMiddleLeft,
.cboxIE6 #cboxMiddleRight {
_behavior: expression(this.src = this.src ? this.src : this.currentStyle.backgroundImage.split('"')[1], this.style.background = "none", this.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src=" + this.src + ", sizingMethod='scale')");
}
/*-----------------------------------------------------------------------------------*/
/* Facebook Likebox popup For Blogger By Helper Blogger
/*-----------------------------------------------------------------------------------*/
#subscribe {
font: 12px/1.2 Arial,Helvetica,san-serif; color:#666;
}
#subscribe a,
#subscribe a:hover,
#subscribe a:visited {
text-decoration:none;
}
.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/1.7.1/jquery.min.js'></script>
<script src="http://helperblogger.webs.com/files/jquery.colorbox.js"></script>
<script type="text/javascript">
jQuery(document).ready(function(){
if (document.cookie.indexOf('visited=true') == -1) {
var fifteenDays = 1000*60*60*24*7;
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;'>
<center><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjFFcg12_g3R5liQWEj78JBbzGwpzZUi5iq3ApShTRyZpYAYaA4FWj52PrlaaC7Sgf3bPPfjMBALCLJkk2D-1u3bF9V331u7bLY7eNsySkyxWe0XfFXurMQy8Grf56znYnruaz3mYFcuQ-C/s1600/LikeUsOnFacebook.png" width:300px; height:150px;"/></center>
<center>
<iframe src="//www.facebook.com/plugins/likebox.php?href=http%3A%2F%2Fwww.facebook.com%2Fbtsnts&width=300&colorscheme=light&show_faces=true&border_color=%23ffffff&stream=false&header=false&height=258" scrolling="no" frameborder="0" style="border:none; overflow:hidden; width:300px; height:258px;" allowtransparency="true"><!-- Warning: Don't edit this line,If you edited this line then your gadget may not work --></iframe></center><p style=" float:right; margin-right:45px; font-size:4px;" ><a style=" font-size:8px; color:#3B78CD; text-decoration:none;" href="http://goo.gl/9fXrd">Grab This Gadget »</a> </p></div>
</div>
Now replace btsnts with your facebook fan page username.