How to Show HTML Code in A Post

This blog promises to provide a different way of blogging. For a moment, as a new comer, I feel down because I can not show some HTML codes that are needed to be showed. But, all I need to do is ask grandpa google and find some good articles.

For example:
I want to show this HTML code below to show you the code to make a link of my blog.

<a href="http://bloggingbydoing.blogspot.com">Tyo's Blog</a>

If I type the code and then showed as this link below (the link on your blog after paste it). But, I need to show the code, so you can copy it.
Tyo's Blog

The codes need to be parsed to be showed as a HTML codes. Manually, change <, > and " with &lt;, &gt;; and &quot;. So, we need to type this code in HTML mode:

&lt;a href=&quot;http://bloggingbydoing.blogspot.com&quot;&gt;Tyo's Blog&lt;/a&gt;

It is not an effective way if we parse a long HTML code manually. Can you imagine to parse this code below? When will you finish it?

<script type='text/javascript'> var thumbnail_mode = &quot;no-float&quot; ; summary_noimg = 430; summary_img = 340; img_thumb_height = 100; img_thumb_width = 120; </script>
<script type='text/javascript'>
//<![CDATA[
function removeHtmlTag(strx,chop){
if(strx.indexOf("<")!=-1)
{
var s = strx.split("<");
for(var i=0;i<s.length;i++){
if(s[i].indexOf(">")!=-1){
s[i] = s[i].substring(s[i].indexOf(">")+1,s[i].length);
}
}
strx = s.join("");
}
chop = (chop < strx.length-1) ? chop : strx.length-2;
while(strx.charAt(chop-1)!=' ' && strx.indexOf(' ',chop)!=-1) chop++;
strx = strx.substring(0,chop-1);
return strx+'...';
}
function createSummaryAndThumb(pID){
var div = document.getElementById(pID);
var imgtag = "";
var img = div.getElementsByTagName("img");
var summ = summary_noimg;
if(img.length>=1) {
imgtag = '<span style="float:left; padding:0px 10px 5px 0px;"><img src="'+img[0].src+'" width="'+img_thumb_width+'px" height="'+img_thumb_height+'px"/></span>';
summ = summary_img;
}
var summary = imgtag + '<div>' + removeHtmlTag(div.innerHTML,summ) + '</div>';
div.innerHTML = summary;
}
//]]>
</script>

 Finally, you can find how to parse or encode-decode this HTML code here.