How to write html code inside Blogger post

when you write plain html code in blogger post in Edit Html or compose section, you see it did not appear as it is as you like, there is so many ways to write plain java script or html code inside the blogger post, i told your here very simple way...
1. Just visit... http://centricle.com/tools/html-entities/
2. Paste your html code
3. click decode, if the script already in decode form, so just click encode.
4. Now paste the script in your blogger post.