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/AVvXsEgUtCHkFCapXhynFRlE5iOPxoiXFKJzlCxKVOwQxp4DnTgscqaiB9MdOOpZ8A7lPeqZ_q66cI2RihQYUfXLHJXNBORSVIuc8i-675T7-9G6p7MwmCYgG29tfc9AiTeooQWjw21yqWwJW92s/s1600/overlay.png) repeat 0 0;}
#colorbox{}
#cboxTopLeft{width:21px; height:21px; background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiG18Jo8Y-a55iiRxOVqAyTrQL10nkCtK4gVjH4njsn9rfhQMFC5dTBQzAK_c17gBFZtlTdzfUYNV7wrCOYhR53QhNQkAdUEAijN6eROZSF1mgi8af-pCoUYL_QEdE6oBI8sQKsONzT9vOS/s1600/controls.png) no-repeat -101px 0;}
#cboxTopRight{width:21px; height:21px; background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiG18Jo8Y-a55iiRxOVqAyTrQL10nkCtK4gVjH4njsn9rfhQMFC5dTBQzAK_c17gBFZtlTdzfUYNV7wrCOYhR53QhNQkAdUEAijN6eROZSF1mgi8af-pCoUYL_QEdE6oBI8sQKsONzT9vOS/s1600/controls.png) no-repeat -130px 0;}
#cboxBottomLeft{width:21px; height:21px; background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiG18Jo8Y-a55iiRxOVqAyTrQL10nkCtK4gVjH4njsn9rfhQMFC5dTBQzAK_c17gBFZtlTdzfUYNV7wrCOYhR53QhNQkAdUEAijN6eROZSF1mgi8af-pCoUYL_QEdE6oBI8sQKsONzT9vOS/s1600/controls.png) no-repeat -101px -29px;}
#cboxBottomRight{width:21px; height:21px; background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiG18Jo8Y-a55iiRxOVqAyTrQL10nkCtK4gVjH4njsn9rfhQMFC5dTBQzAK_c17gBFZtlTdzfUYNV7wrCOYhR53QhNQkAdUEAijN6eROZSF1mgi8af-pCoUYL_QEdE6oBI8sQKsONzT9vOS/s1600/controls.png) no-repeat -130px -29px;}
#cboxMiddleLeft{width:21px; background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiG18Jo8Y-a55iiRxOVqAyTrQL10nkCtK4gVjH4njsn9rfhQMFC5dTBQzAK_c17gBFZtlTdzfUYNV7wrCOYhR53QhNQkAdUEAijN6eROZSF1mgi8af-pCoUYL_QEdE6oBI8sQKsONzT9vOS/s1600/controls.png) left top repeat-y;}
#cboxMiddleRight{width:21px; background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiG18Jo8Y-a55iiRxOVqAyTrQL10nkCtK4gVjH4njsn9rfhQMFC5dTBQzAK_c17gBFZtlTdzfUYNV7wrCOYhR53QhNQkAdUEAijN6eROZSF1mgi8af-pCoUYL_QEdE6oBI8sQKsONzT9vOS/s1600/controls.png) right top repeat-y;}
#cboxTopCenter{height:21px; background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjT8HCImlHe_zurAXxc0fmNxd7-TvCGuU094tGM2q1iDh97ASpbJQYPD_yUitUU2HlW5FK1Uins_iHxDJU8Z3yU5gtP8aSlnelSLjIsTh0mR274afi_DwMS2VnOTIq3pa5N_zC06avyrh39/s1600/border.png) 0 0 repeat-x;}
#cboxBottomCenter{height:21px; background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjT8HCImlHe_zurAXxc0fmNxd7-TvCGuU094tGM2q1iDh97ASpbJQYPD_yUitUU2HlW5FK1Uins_iHxDJU8Z3yU5gtP8aSlnelSLjIsTh0mR274afi_DwMS2VnOTIq3pa5N_zC06avyrh39/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/AVvXsEiG18Jo8Y-a55iiRxOVqAyTrQL10nkCtK4gVjH4njsn9rfhQMFC5dTBQzAK_c17gBFZtlTdzfUYNV7wrCOYhR53QhNQkAdUEAijN6eROZSF1mgi8af-pCoUYL_QEdE6oBI8sQKsONzT9vOS/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/AVvXsEiG18Jo8Y-a55iiRxOVqAyTrQL10nkCtK4gVjH4njsn9rfhQMFC5dTBQzAK_c17gBFZtlTdzfUYNV7wrCOYhR53QhNQkAdUEAijN6eROZSF1mgi8af-pCoUYL_QEdE6oBI8sQKsONzT9vOS/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/AVvXsEhIizSt_nC1cLPAUN99wHaJs_c1t4kFXcbXvHp8nVukAtMO84IUD8TpA6u80pwg1RxTlxJMJ2wJxjbMGskfrQ5ZMRPKxwqE2gC3L4qvAW8mHATCewWJmYbYsHOCKqN0GeVRp6E9XLelKt5O/h120/loading.gif) no-repeat center center;}
#cboxLoadingGraphic{background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhIizSt_nC1cLPAUN99wHaJs_c1t4kFXcbXvHp8nVukAtMO84IUD8TpA6u80pwg1RxTlxJMJ2wJxjbMGskfrQ5ZMRPKxwqE2gC3L4qvAW8mHATCewWJmYbYsHOCKqN0GeVRp6E9XLelKt5O/h120/loading.gif) no-repeat center center;}
#cboxClose{position:absolute; bottom:0; right:0; background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiG18Jo8Y-a55iiRxOVqAyTrQL10nkCtK4gVjH4njsn9rfhQMFC5dTBQzAK_c17gBFZtlTdzfUYNV7wrCOYhR53QhNQkAdUEAijN6eROZSF1mgi8af-pCoUYL_QEdE6oBI8sQKsONzT9vOS/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/AVvXsEhK3XjkJ44LV1kZQFYOA6AkOsSW46C_Tp15mZVmlRKKCNSiMp1DI1GpGMO_aHGT2TPP2dfaoKCpod6sFUyZ5gMbNe6eLjaCi1wwLTas6Tg4pao8JYK2zDLDdLfdvXcDf28TL9I4XJdOgNJ0/s1600/borderTopLeft.png);}
.cboxIE6 #cboxTopCenter{background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi1PYWqhnMyT5587MjyIj2av_H3DgAOQiatCRTkbykDDoYlOzpdpHmN5MAKgpRwhTzOJfvdlnagcrueAm5FFAGIBvqM3bWznSTaELllBGr_BLHK3r1Q4CU-zOD_Pb5nSn0G6-HJHKpAPlpf/s1600/borderTopCenter.png);}
.cboxIE6 #cboxTopRight{background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjsXYVMqBMRXqEPWqFDSjbNZGAhGWp0OGGZqCcn-MYAWm_eAkFWpOLw6LZnPcs7n-Jv8X16VkSuZFqRiTxXRxU2EF5IEnGBw-onn2UpTe1t93asSAUATHHqsofnXGRrBgdiTyz27rWwNrJf/s1600/borderTopRight.png);}
.cboxIE6 #cboxBottomLeft{background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjsXYVMqBMRXqEPWqFDSjbNZGAhGWp0OGGZqCcn-MYAWm_eAkFWpOLw6LZnPcs7n-Jv8X16VkSuZFqRiTxXRxU2EF5IEnGBw-onn2UpTe1t93asSAUATHHqsofnXGRrBgdiTyz27rWwNrJf/s1600/borderTopRight.png);}
.cboxIE6 #cboxBottomCenter{background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhp10-CO1n6MZ8_z_nhd1R4G6E8IguxEGGHyWfCXS9zqEsauH5DO9lmjnxRy4q5foF4PtZh0sI_pGNIbgy9sUt6Ze9oEbMgHBgoBNKYdqyqBgqNklcRuAZvfTd5Ig9hSVkIP8BSyzJRHuyV/s1600/borderBottomCenter.png);}
.cboxIE6 #cboxBottomRight{background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiLLeyQaiA56FXuH8xCM0m987o0KUa9BOOELohQmWxeujGwqfdeA6vtKbG2atHl7FwYbCa-uii8KHqLB0ftVeBMrDduyx2hR6HyqW3rlzImXpeAt-gTNVPqMAoZI7t-baJ5mEVkLb9U30Yo/s1600/borderBottomRight.png);}
.cboxIE6 #cboxMiddleLeft{background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgNI5NvSI2eGZT5CktEtwLa6j7eDhtCywyq2BFwmxXjWZjzFZ1_r7iYhYx9HtIhO9yw1-4c9eP58P-x-IJsDcB6J1H5ryGGsega6CIPNU1zWRC3KgRcCbpuJc3oY1kkCgZuZWhhhyphenhyphensOZ6l9/s1600/borderMiddleLeft.png);}
.cboxIE6 #cboxMiddleRight{background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEid6riXffCaEru4MfgtMdloxFSzWCv7W5m7HroyglqgQtNQU1dEoIf9PLCWhqDv61dZs3o2_zo1nolRataJo9UpY5zjfxKhX5Eo2AqYXzJflEJ-8BR9olr2MWnT3f6R1AeN4dsdDrYf6VjR/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/AVvXsEizpBGA9m5HCPTCJZFKImrK4uTygB1cpMf9o7lQ31atgaiDPq93qCRFT8mv_9FyAdzyOs1m1zBuGmUH8f8UMU4I_yAlObzvBh0Lx3jfDpUAVXtAtbUyZ629Hr0m78ucCzl5pcXnaXqq7mEs/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.