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Login Blogger -> layout -> edit HTML

scroll down, copy paste below code just before ]]></b:skin> tag.

.showpageArea a {
text-decoration:underline;
}
.showpageNum a {
border:1px solid #CCCCCC;
margin:0 3px;
padding:3px 7px;
text-decoration:none;
}
.showpageNum a:hover {
background-color:#CCCCCC;
border:1px solid #CCCCCC;
}
.showpagePoint {
-moz-background-clip:border;
-moz-background-inline-policy:continuous;
-moz-background-origin:padding;
background:#CCCCCC none repeat scroll 0 0;
border:1px solid #CCCCCC;
color:#333333;
margin:0 3px;
padding:3px 7px;
text-decoration:none;
}
.showpageOf {
margin:0 3px 0 0;
padding:3px 7px;
text-decoration:none;
}
.showpage a {
border:1px solid #CCCCCC;
padding:3px 7px;
text-decoration:none;
}
.showpage a:hover {
text-decoration:none;
}
.showpageNum a:link, .showpage a:link {
color:#333333;
text-decoration:none;
}



Now save the Template.

Go to layout -> Page element click on 'add gadget' and select html/java script

page below code to html/java script gadget

<script type='text/javascript'>

var home_page_url = location.href;


var pageCount=1;
var displayPageNum=6;
var upPageWord ='Previous';
var downPageWord ='Next';


function showpageCount(json) {
var thisUrl = home_page_url;
var htmlMap = new Array();
var thisNum = 1;
var postNum=1;
var itemCount = 0;
var fFlag = 0;
var eFlag = 0;
var html= '';
var upPageHtml ='';
var downPageHtml ='';





for(var i=0, post; post = json.feed.entry[i]; i  ) {

var timestamp1 = post.published.$t.substring(0,19) post.published.$t.substring(23,29);
timestamp = encodeURIComponent(timestamp1);


var title = post.title.$t;

if(title!=''){
if(itemCount==0 || (itemCount % pageCount ==(pageCount-1))){
if(thisUrl.indexOf(timestamp)!=-1 ){
thisNum = postNum;
}

if(title!='') postNum  ;
htmlMap[htmlMap.length] = '/search?updated-max=' timestamp '&max-results=' pageCount;
}
}
itemCount  ;

}

for(var p =0;p< htmlMap.length;p  ){
if(p>=(thisNum-displayPageNum-1) && p<(thisNum displayPageNum)){
if(fFlag ==0 && p == thisNum-2){
if(thisNum==2){
upPageHtml = '<span class="showpage"><a href="/">'  upPageWord  '</a></span>';
}else{
upPageHtml = '<span class="showpage"><a href="' htmlMap[p] '">'  upPageWord  '</a></span>';
}

fFlag  ;
}

if(p==(thisNum-1)){
html  = '<span class="showpagePoint">' thisNum '</span>';
}else{
if(p==0){
html  = '<span class="showpageNum"><a href="/">1</a></span>';

}else{
html  = '<span class="showpageNum"><a href="' htmlMap[p] '">'  (p 1)  '</a></span>';
}
}

if(eFlag ==0 && p == thisNum){
downPageHtml = '<span class="showpage"> <a href="' htmlMap[p] '">'  downPageWord  '</a></span>';
eFlag  ;
}
}
}

if(thisNum>1){
html = '' upPageHtml ' ' html  ' ';
}

html = '<div class="showpageArea"><span  class="showpageOf"> Pages (' (postNum-1) ')</span>' html;

if(thisNum<(postNum-1)){
html  = downPageHtml;
}

if(postNum==1) postNum  ;
html  = '</div>';


var pageArea = document.getElementsByName("pageArea");
var blogPager = document.getElementById("blog-pager");

if(postNum <= 2){
html ='';
}

for(var p =0;p< pageArea.length;p  ){
pageArea[p].innerHTML = html;
}

if(pageArea&&pageArea.length>0){
html ='';
}

if(blogPager){
blogPager.innerHTML = html;
}


}


function showpageCount2(json) {

var thisUrl = home_page_url;
var htmlMap = new Array();
var isLablePage = thisUrl.indexOf("/search/label/")!=-1;
var thisLable = isLablePage ? thisUrl.substr(thisUrl.indexOf("/search/label/") 14,thisUrl.length) : "";
thisLable = thisLable.indexOf("?")!=-1 ? thisLable.substr(0,thisLable.indexOf("?")) : thisLable;
var thisNum = 1;
var postNum=1;
var itemCount = 0;
var fFlag = 0;
var eFlag = 0;
var html= '';
var upPageHtml ='';
var downPageHtml ='';



var labelHtml = '<span class="showpageNum"><a href="/search/label/' thisLable '?&max-results=' pageCount '">';
var thisUrl = home_page_url;


for(var i=0, post; post = json.feed.entry[i]; i  ) {

var timestamp1 = post.published.$t.substring(0,19) post.published.$t.substring(23,29);
timestamp = encodeURIComponent(timestamp1);



var title = post.title.$t;

if(title!=''){
if(itemCount==0 || (itemCount % pageCount ==(pageCount-1))){
if(thisUrl.indexOf(timestamp)!=-1 ){
thisNum = postNum;
}

if(title!='') postNum  ;
htmlMap[htmlMap.length] = '/search/label/' thisLable '?updated-max=' timestamp '&max-results=' pageCount;

}
}
itemCount  ;
}

for(var p =0;p< htmlMap.length;p  ){
if(p>=(thisNum-displayPageNum-1) && p<(thisNum displayPageNum)){
if(fFlag ==0 && p == thisNum-2){
if(thisNum==2){
upPageHtml = labelHtml   upPageWord  '</a></span>';
}else{
upPageHtml = '<span class="showpage"><a href="' htmlMap[p] '">'  upPageWord  '</a></span>';
}

fFlag  ;
}

if(p==(thisNum-1)){
html  = '<span class="showpagePoint">' thisNum '</span>';
}else{
if(p==0){
html = labelHtml '1</a></span>';
}else{
html  = '<span class="showpageNum"><a href="' htmlMap[p] '">'  (p 1)  '</a></span>';
}
}

if(eFlag ==0 && p == thisNum){
downPageHtml = '<span class="showpage"> <a href="' htmlMap[p] '">'  downPageWord  '</a></span>';
eFlag  ;
}
}
}

if(thisNum>1){
if(!isLablePage){
html = '' upPageHtml ' ' html  ' ';
}else{
html = '' upPageHtml ' ' html  ' ';
}
}

html = '<div class="showpageArea"><span  class="showpageOf"> Pages (' (postNum-1) ')</span>' html;

if(thisNum<(postNum-1)){
html  = downPageHtml;
}

if(postNum==1) postNum  ;
html  = '</div>';

var pageArea = document.getElementsByName("pageArea");
var blogPager = document.getElementById("blog-pager");

if(postNum <= 2){
html ='';
}

for(var p =0;p< pageArea.length;p  ){
pageArea[p].innerHTML = html;
}

if(pageArea&&pageArea.length>0){
html ='';
}

if(blogPager){
blogPager.innerHTML = html;
}


}


</script>
<script type='text/javascript'>

var thisUrl = home_page_url;
if (thisUrl.indexOf("/search/label/")!=-1){
if (thisUrl.indexOf("?updated-max")!=-1){
var lblname1 = thisUrl.substring(thisUrl.indexOf("/search/label/") 14,thisUrl.indexOf("?updated-max"));
}else{
var lblname1 = thisUrl.substring(thisUrl.indexOf("/search/label/") 14,thisUrl.indexOf("?&max"));
}
}

var home_page = "/";
if (thisUrl.indexOf("?q=")==-1){
if (thisUrl.indexOf("/search/label/")==-1){
document.write('<script src="' home_page 'feeds/posts/summary?alt=json-in-script&callback=showpageCount&max-results=99999" ><\/script>')
}else{document.write('<script src="' home_page 'feeds/posts/full/-/' lblname1 '?alt=json-in-script&callback=showpageCount2&max-results=99999" ><\/script>')
}
}
</script>


Now, Drag that gadget below 'Blog posts'

Done.

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