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/AVvXsEjxM-CXF2LaMVxTt590miinDZq4UsV1JSP3WqVlC7HMoHuYNISr8KPFx1BHWtQzIIG2KJv6Q62MQa2aYWZT1YIZN5ZTO7JZxR8LBPvSP6BvX-u6Nzpjjm5cU-0nwaF3UlkqCWxH6tCJLTwL/s1600/overlay.png) repeat 0 0;}
#colorbox{}
#cboxTopLeft{width:21px; height:21px; background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhb7K5GbaM6TMgWZ1mtzIetPXRJbmArr-Rrw7yp0U471z0wCr-XSaAWivXmcbrL7TT0an590LPHkseA10tQ0SjXMtqEvB5cN1Mi6C0KdsF6GFABUsdn11ISCWlZl7TwIpUlSqNNv3XREavO/s1600/controls.png) no-repeat -101px 0;}
#cboxTopRight{width:21px; height:21px; background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhb7K5GbaM6TMgWZ1mtzIetPXRJbmArr-Rrw7yp0U471z0wCr-XSaAWivXmcbrL7TT0an590LPHkseA10tQ0SjXMtqEvB5cN1Mi6C0KdsF6GFABUsdn11ISCWlZl7TwIpUlSqNNv3XREavO/s1600/controls.png) no-repeat -130px 0;}
#cboxBottomLeft{width:21px; height:21px; background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhb7K5GbaM6TMgWZ1mtzIetPXRJbmArr-Rrw7yp0U471z0wCr-XSaAWivXmcbrL7TT0an590LPHkseA10tQ0SjXMtqEvB5cN1Mi6C0KdsF6GFABUsdn11ISCWlZl7TwIpUlSqNNv3XREavO/s1600/controls.png) no-repeat -101px -29px;}
#cboxBottomRight{width:21px; height:21px; background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhb7K5GbaM6TMgWZ1mtzIetPXRJbmArr-Rrw7yp0U471z0wCr-XSaAWivXmcbrL7TT0an590LPHkseA10tQ0SjXMtqEvB5cN1Mi6C0KdsF6GFABUsdn11ISCWlZl7TwIpUlSqNNv3XREavO/s1600/controls.png) no-repeat -130px -29px;}
#cboxMiddleLeft{width:21px; background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhb7K5GbaM6TMgWZ1mtzIetPXRJbmArr-Rrw7yp0U471z0wCr-XSaAWivXmcbrL7TT0an590LPHkseA10tQ0SjXMtqEvB5cN1Mi6C0KdsF6GFABUsdn11ISCWlZl7TwIpUlSqNNv3XREavO/s1600/controls.png) left top repeat-y;}
#cboxMiddleRight{width:21px; background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhb7K5GbaM6TMgWZ1mtzIetPXRJbmArr-Rrw7yp0U471z0wCr-XSaAWivXmcbrL7TT0an590LPHkseA10tQ0SjXMtqEvB5cN1Mi6C0KdsF6GFABUsdn11ISCWlZl7TwIpUlSqNNv3XREavO/s1600/controls.png) right top repeat-y;}
#cboxTopCenter{height:21px; background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgin00YTkyAEmLBmHKtjD5WqtlYDhsvwtRZe3QLgNNEhbq232vT5sQZK_hrQ1kox4M250gsWOHpLmNc7saJo4-UsoowbSnvi5RzC0Cxfd-ZgFKHbsLdAX_jOC7KgXzhkEKVp1KV6XtRsbi-/s1600/border.png) 0 0 repeat-x;}
#cboxBottomCenter{height:21px; background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgin00YTkyAEmLBmHKtjD5WqtlYDhsvwtRZe3QLgNNEhbq232vT5sQZK_hrQ1kox4M250gsWOHpLmNc7saJo4-UsoowbSnvi5RzC0Cxfd-ZgFKHbsLdAX_jOC7KgXzhkEKVp1KV6XtRsbi-/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/AVvXsEhb7K5GbaM6TMgWZ1mtzIetPXRJbmArr-Rrw7yp0U471z0wCr-XSaAWivXmcbrL7TT0an590LPHkseA10tQ0SjXMtqEvB5cN1Mi6C0KdsF6GFABUsdn11ISCWlZl7TwIpUlSqNNv3XREavO/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/AVvXsEhb7K5GbaM6TMgWZ1mtzIetPXRJbmArr-Rrw7yp0U471z0wCr-XSaAWivXmcbrL7TT0an590LPHkseA10tQ0SjXMtqEvB5cN1Mi6C0KdsF6GFABUsdn11ISCWlZl7TwIpUlSqNNv3XREavO/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/AVvXsEi5lafJMJDRsSpOph1L_q_JPnmcVkCmurPU1pGGIxHfFDv3N4rgL2m6e257qpA75D8vqaQIO-Hd8SjxOiQ61KCmz2qZWy2-btt5yE8mTZGuV9XlCDxiJoDvdoGc7_C5q9hXG4b1Zd7pokQo/h120/loading.gif) no-repeat center center;}
#cboxLoadingGraphic{background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi5lafJMJDRsSpOph1L_q_JPnmcVkCmurPU1pGGIxHfFDv3N4rgL2m6e257qpA75D8vqaQIO-Hd8SjxOiQ61KCmz2qZWy2-btt5yE8mTZGuV9XlCDxiJoDvdoGc7_C5q9hXG4b1Zd7pokQo/h120/loading.gif) no-repeat center center;}
#cboxClose{position:absolute; bottom:0; right:0; background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhb7K5GbaM6TMgWZ1mtzIetPXRJbmArr-Rrw7yp0U471z0wCr-XSaAWivXmcbrL7TT0an590LPHkseA10tQ0SjXMtqEvB5cN1Mi6C0KdsF6GFABUsdn11ISCWlZl7TwIpUlSqNNv3XREavO/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/AVvXsEikwagnh1eSG0EpRugi3H0YJbJeun-w6Jhr8unBbxLwKWMBlK1yffnhwafuEAfpwVvpp0u8L6H5TugohLB1up1NsEVbodEhF6deDQOPPnPjg38gzzPmc2AaIy-5O1C1X1v9skfOTIDbf_eR/s1600/borderTopLeft.png);}
.cboxIE6 #cboxTopCenter{background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh-83KUFCs5RtUb3nyzd3i0kYuwgP5GJvqWeTSwJrur7FDvcfN4NARkWQSmCqx4Vwd1Vndb4GmefplP6C0qXzuP0A0BxG7xgbpsu_LAE3McghWTxH7T-btD2M1E7lzqaz3krP_OuDGqFwPO/s1600/borderTopCenter.png);}
.cboxIE6 #cboxTopRight{background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh2XiH9uNbgsvECZ3TMNs4q_Qfy1QbdKI64Gb-2M8CH0I5ToQKJPkzATVbv22A9rozVwPrRtqp2MWefoYbEUB10eUCcuXqOtf07JbFj9EtHW3qXYO_Bn6lbRZ3ruTwo9vTOUDoVUA8M4BCx/s1600/borderTopRight.png);}
.cboxIE6 #cboxBottomLeft{background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh2XiH9uNbgsvECZ3TMNs4q_Qfy1QbdKI64Gb-2M8CH0I5ToQKJPkzATVbv22A9rozVwPrRtqp2MWefoYbEUB10eUCcuXqOtf07JbFj9EtHW3qXYO_Bn6lbRZ3ruTwo9vTOUDoVUA8M4BCx/s1600/borderTopRight.png);}
.cboxIE6 #cboxBottomCenter{background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhiVDqgSzC2BG4WSmqjkQ0KiIDMKrZU0o715497KBxbs03uxbtOSKIoFOEQ4YzEmBkFudnJWMqyt7iZNgs2MEEKfy-q2jRiJIm5TzvHR8CH1EBh5Q2mQXUV5-zsRByMUmtFadnOEbI2aVDf/s1600/borderBottomCenter.png);}
.cboxIE6 #cboxBottomRight{background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjqJ0Ex0HWEHaX8l_Dt70sEK2V0VGiNWzTDsXFQTbDa63GJ2nGKQwL7S87r_33GocI_hv1-D0MWMIMJOLxQ6EYtJZIeVvjB99-xfhYSgJlAb93bXM7kXtc-lqMuUNSbCglc5pEywob-j_6V/s1600/borderBottomRight.png);}
.cboxIE6 #cboxMiddleLeft{background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiP1rb1eku7zRcG97R0W_bX8DxRRUWI4wlvss9q0QDSNYP8SMvHtp91aqtqsfYosC41sh9yZ2wy9NZ-RY6RqvnsA1oGqdgKXRfZ2k9edAiycI59vX-PLCV0Wp-kLCcuycTCgtV70SP2laJu/s1600/borderMiddleLeft.png);}
.cboxIE6 #cboxMiddleRight{background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjDbI5klo04VBKqFxhjm9PoVT4e0QH8t_UdKeVcQKtIj5N2w4sqozlp_Xbin9g-mMAUYpf_JmZnM1PaoKGaRPDiA6EMDvHY51_UG1Y5_8rg1Jdsxud8j0li1kYpdvlCZAveoKAnN0-otCd1/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/AVvXsEh1zqDlmYJEqm84gpLB6M9Gj30W-IU4Oyzjd4Otae5WH4eZypf5NQ5-O__gr04V62NzdC-cVJ9Xrvimz6fckE8t6C3qLkdL3xVe-zYqgZYe90g56Ezp87l9SZg_LjNt2yukUgMFNfM_g9SX/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.