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As default, user of wordpress blog is unable to insert javascript in their post. Only simple and “safe” HTML code allowed. For security reason this is a best way to prevent user (especially when you host multiple blog in server) to insert or inject any malicious HTML that can harm your visitor.

But it’s not good idea when we want to write article and also perform advanced view e.g: put iframe into post, display alertbox to greet readers, etc.

Another case if we want to put any special characters (apostrophie, quote) and any script. To enable javascript and put RAW HTML inside wp post, we must install RAW HTML

Requirements :

• WordPress 2.3.1 – 2.7
• Disable visual editor for better results – some characters (e.g. the ampersand) may still be encoded if it’s enabled.

Now, after plugin activated, you can freely type and insert any script and chars inside your post.
Try it.

Read from here for any instructions and tutorial.