Edit in JSFiddle

<!-- jquery popup facebook like box with timer by Mult-focos http://mult-focos.blogspot.com.br/2013/07/pop-up-de-curtir-no-facebook.html -->
<style type="text/css">
#makingdifferentpopup{
position: fixed;
top:100px;
z-index:9999;
display:none;
padding:0px;
right:600px;
border:10px solid rgba(82, 82, 82, 0.7);
-webkit-background-clip: padding-box; /* for Safari */
background-clip: padding-box; /* for IE9+, Firefox 4+, Opera, Chrome */
-webkit-border-radius:8px 8px 8px 8px;
-moz-border-radius:8px 8px 8px 8px;
border-radius:8px 8px 8px 8px;
width:400px;
height:360px;
overflow:hidden;
}
#makingdifferentpopup span{
font-size:20px !important;
font-weight:bold !important;
}
#makingdifferentpopup h1{
background:#6d84b4 url(https://lh6.googleusercontent.com/-0kKqJWus_AE/U-OSlhJvjmI/AAAAAAAAF60/95fq_I21Z_U/w9-h14-no/cadeado.png) 98% no-repeat;
border:1px solid #3b5998 !important;
color:#ffffff !important;
font-size:20px !important;
font-weight:700 !important;
padding:5px !important;
margin:0 !important;
font-family:'"lucida grande",tahoma,verdana,arial,sans-serif !important;
overflow:hidden !important;
}
.htmlarea{
font-size:12px !important;
font-weight:normal !important;
height:265px !important;
padding:1px !important;
background:#fff !important;
border-bottom:2px solid #ddd;
overflow:hidden !important;
}
#mdfooter{
text-align:left;
background:#f2f2f2 !important;
height:56px !important;
padding:10px 10px 10px 10px !important;
overflow:hidden !important;
}
#mdclose{
float:right;
background-color:#eee !important;
border:1px solid #ccc !important;
color:#111 !important;
font-weight:bold !important;
padding:5px 8px 5px 8px !important;
text-decoration:none !important;
display:inline-block !important;
font-family:'"lucida grande",tahoma,verdana,arial,sans-serif !important;
outline:none !important;
position:relative !important;
font-size:18px !important;
margin:1px !important;
}
#mdclose:active{
top:1px;
left:1px;
}
.grabthis{
bottom:80px;
font:8px "lucida grande",tahoma,verdana,arial,sans-serif;
position:absolute;
right:6px;
text-align:right;
z-index: 99999;
}
.grabthis a{
color: #000;
text-decoration:none;
}
.grabthis a:hover{
text-decoration:underline;
}
</style>
<span id="preserve7d4beee01aa74e68a768ed3489591ac5" class="wlWriterPreserve"><span id="preserveb0d1f992eb57438bbb3af97c820df5dd" class="wlWriterPreserve"><script type='text/javascript'>
jQuery(document).ready(function() {
function makingdifferent_ppopup()  {
var sec = 10
var timer = setInterval(function() {
   $("#mdfooter span").text(sec--);
   if (sec == 0) {
      $("#makingdifferentpopup").fadeOut("slow");
      clearInterval(timer);
   }
},1000);
  var mdwh = jQuery(window).height();
  var mdpph = jQuery("#makingdifferentpopup").height();
  var mdfromTop = jQuery(window).scrollTop()+50;
 jQuery("#makingdifferentpopup").css({"top":mdfromTop});}
jQuery(window).fadeIn(makingdifferent_ppopup).resize(makingdifferent_ppopup)
 //alert(jQuery.cookie('sreqshown'));
 //var mdww = jQuery(window).width();
 //var mdppw = jQuery("#makingdifferentpopup").width();
 //var mdleftm = (mdww-mdppw)/2;
   var mdleftm = 500;
 //var mdwh = jQuery(window).height();
 //var mdpph = jQuery("#makingdifferentpopup").height();
 //var mdfromTop = (jQuery(window).scrollTop()+mdwh-mdpph) / 2;
 jQuery("#makingdifferentpopup").animate({opacity: "1", left: "0" , left:  mdleftm}, 0).show();
     jQuery("#mdclose").click(function() {
jQuery("#makingdifferentpopup").animate({opacity: "0", left: "-5000000"}, 1000).show();});});
</script></span></span>
<div id="makingdifferentpopup">
<h1>
Junte-se a nós no Facebook</h1>
<div class="htmlarea">
<iframe style="border-top-style: none; overflow: hidden; border-left-style: none; height: 250px; border-bottom-style: none; border-right-style: none; width: 400px" src="//www.facebook.com/plugins/likebox.php?href=https%3A%2F%2Fwww.facebook.com/SUA PÁGINA&width=400&colorscheme=light&show_faces=true&border_color=%23fff&stream=false&header=false&height=250" frameborder="0" allowtransparency scrolling="no"></iframe>
<div class="grabthis">
By <a href="http://www.mult-focos.com/" target="_blank">Mult-focos</a> / <a href="http://www.mult-focos.com/2013/07/pop-up-de-curtir-no-facebook.html" target="_blank">+Adquira este widget!</a> </div>
</div>
<div id="mdfooter">
Aguarde por favor...<span>10</span> Seconds <a onclick="return false;" id="mdclose" href="#">Cancel</a> </div>
</div>
<!-- Fim popup –>

<!-- jquery popup facebook like box with timer by Mult-focos http://mult-focos.blogspot.com.br/2013/07/pop-up-de-curtir-no-facebook.html -->
<style type="text/css">
#makingdifferentpopup{
position: fixed;
top:100px;
z-index:9999;
display:none;
padding:0px;
right:600px;
border:10px solid rgba(82, 82, 82, 0.7);
-webkit-background-clip: padding-box; /* for Safari */
background-clip: padding-box; /* for IE9+, Firefox 4+, Opera, Chrome */
-webkit-border-radius:8px 8px 8px 8px;
-moz-border-radius:8px 8px 8px 8px;
border-radius:8px 8px 8px 8px;
width:400px;
height:360px;
overflow:hidden;
}
#makingdifferentpopup span{
font-size:20px !important;
font-weight:bold !important;
}
#makingdifferentpopup h1{
background:#6d84b4 url(https://lh6.googleusercontent.com/-0kKqJWus_AE/U-OSlhJvjmI/AAAAAAAAF60/95fq_I21Z_U/w9-h14-no/cadeado.png) 98% no-repeat;
border:1px solid #3b5998 !important;
color:#ffffff !important;
font-size:20px !important;
font-weight:700 !important;
padding:5px !important;
margin:0 !important;
font-family:'"lucida grande",tahoma,verdana,arial,sans-serif !important;
overflow:hidden !important;
}
.htmlarea{
font-size:12px !important;
font-weight:normal !important;
height:265px !important;
padding:1px !important;
background:#fff !important;
border-bottom:2px solid #ddd;
overflow:hidden !important;
}
#mdfooter{
text-align:left;
background:#f2f2f2 !important;
height:56px !important;
padding:10px 10px 10px 10px !important;
overflow:hidden !important;
}
#mdclose{
float:right;
background-color:#eee !important;
border:1px solid #ccc !important;
color:#111 !important;
font-weight:bold !important;
padding:5px 8px 5px 8px !important;
text-decoration:none !important;
display:inline-block !important;
font-family:'"lucida grande",tahoma,verdana,arial,sans-serif !important;
outline:none !important;
position:relative !important;
font-size:18px !important;
margin:1px !important;
}
#mdclose:active{
top:1px;
left:1px;
}
.grabthis{
bottom:80px;
font:8px "lucida grande",tahoma,verdana,arial,sans-serif;
position:absolute;
right:6px;
text-align:right;
z-index: 99999;
}
.grabthis a{
color: #000;
text-decoration:none;
}
.grabthis a:hover{
text-decoration:underline;
}
</style>
<span id="preserve7d4beee01aa74e68a768ed3489591ac5" class="wlWriterPreserve"><span id="preserveb0d1f992eb57438bbb3af97c820df5dd" class="wlWriterPreserve"><script type='text/javascript'>
jQuery(document).ready(function() {
function makingdifferent_ppopup()  {
var sec = 10
var timer = setInterval(function() {
   $("#mdfooter span").text(sec--);
   if (sec == 0) {
      $("#makingdifferentpopup").fadeOut("slow");
      clearInterval(timer);
   }
},1000);
  var mdwh = jQuery(window).height();
  var mdpph = jQuery("#makingdifferentpopup").height();
  var mdfromTop = jQuery(window).scrollTop()+50;
 jQuery("#makingdifferentpopup").css({"top":mdfromTop});}
jQuery(window).fadeIn(makingdifferent_ppopup).resize(makingdifferent_ppopup)
 //alert(jQuery.cookie('sreqshown'));
 //var mdww = jQuery(window).width();
 //var mdppw = jQuery("#makingdifferentpopup").width();
 //var mdleftm = (mdww-mdppw)/2;
   var mdleftm = 500;
 //var mdwh = jQuery(window).height();
 //var mdpph = jQuery("#makingdifferentpopup").height();
 //var mdfromTop = (jQuery(window).scrollTop()+mdwh-mdpph) / 2;
 jQuery("#makingdifferentpopup").animate({opacity: "1", left: "0" , left:  mdleftm}, 0).show();
     jQuery("#mdclose").click(function() {
jQuery("#makingdifferentpopup").animate({opacity: "0", left: "-5000000"}, 1000).show();});});
</script></span></span>
<div id="makingdifferentpopup">
<h1>
Junte-se a nós no Facebook</h1>
<div class="htmlarea">
<iframe style="border-top-style: none; overflow: hidden; border-left-style: none; height: 250px; border-bottom-style: none; border-right-style: none; width: 400px" src="//www.facebook.com/plugins/likebox.php?href=https%3A%2F%2Fwww.facebook.com/SUA PÁGINA&width=400&colorscheme=light&show_faces=true&border_color=%23fff&stream=false&header=false&height=250" frameborder="0" allowtransparency scrolling="no"></iframe>
<div class="grabthis">
By <a href="http://www.mult-focos.com/" target="_blank">Mult-focos</a> / <a href="http://www.mult-focos.com/2013/07/pop-up-de-curtir-no-facebook.html" target="_blank">+Adquira este widget!</a> </div>
</div>
<div id="mdfooter">
Aguarde por favor...<span>10</span> Seconds <a onclick="return false;" id="mdclose" href="#">Cancel</a> </div>
</div>
<!-- Fim popup –>