How to add a table of content in blogpost working in automatically

first code. 1
<link href='http://fortawesome.github.io/Font-Awesome/assets/font-awesome/css/font-awesome.css' rel='stylesheet'/>           

<link href='http://fonts.googleapis.com/css?family=Oswald' rel='stylesheet' type='text/css'/>


<script type='text/javascript'>            

//<![CDATA[                      

function mbtTOC() {var mbtTOC=i=headlength=gethead=0;           
headlength = document.getElementById("post-toc").getElementsByTagName("h2").length;for (i = 0; i < headlength; i++)            

{gethead = document.getElementById("post-toc").getElementsByTagName("h2")[i].textContent;document.getElementById("post-toc").getElementsByTagName("h2")[i].setAttribute("id", "point"+i);mbtTOC = "<li><a href='#point"+i+"'>"+gethead+"</a></li>";document.getElementById("mbtTOC").innerHTML += mbtTOC;}}function mbtToggle() {var mbt = document.getElementById('mbtTOC');if (mbt .style.display === 'none') {mbt .style.display = 'block';} else {mbt .style.display = 'none';}}           
//]]>              
</script>
Second code. 2
]]></b:skin>
.mbtTOC{border:5px solid #f7f0b8;box-shadow:1px 1px 0 #EDE396;background-color:#FFFFE0;color:#707037;line-height:1.4em;margin:30px auto;padding:20px 30px 20px 10px; font-family:oswald, arial;display: block;width: 70%;}           
.mbtTOC ol,.mbtTOC ul {margin:0;padding:0;}           
.mbtTOC ul {list-style:none;}           
.mbtTOC ol li,.mbtTOC ul li {padding:15px 0 0; margin:0 0 0 30px;font-size:15px;}           
.mbtTOC a{color:#0080ff;text-decoration:none;}           
.mbtTOC a:hover{text-decoration:underline; }

        
.mbtTOC button{background:#FFFFE0; font-family:oswald, arial; font-size:20px;position:relative; outline:none;cursor:pointer; border:none; color:#707037;padding:0 0 0 15px;}           

.mbtTOC button:after{content: "\f0dc"; font-family:FontAwesome; position:relative; left:10px; font-size:20px;}
Third code. 3
<data:post.body/> 
Note: If you will find more than one <data:post.body/> so replace all by this code below.
<div id="post-toc"><data:post.body/></div>
Fourth code. 4
<div class="mbtTOC"> 
    <button onclick="mbtToggle()">Table Of Contents</button> 
    <ul id="mbtTOC"></ul> 

    </div>
<script>mbtTOC();</script>
Note: If you want to Change those colour 

Change background color O#FFFFE
Change border color #f7f0b8
Change font color #707037
Change Anchor link color #0080FF
Change the font size of anchor Links 15px  

Change the font size of TOC heading text 20px