Weird Page Oddity

I've got a page in front of me, HTML file, local drive.

When I view it in IE, I try to change the encoding to Thai. But it stays on Unicode.

How can I change it to Thai? I need to do this because the characters aren't appearing correctly.

Also, is there a way to specify the encoding using HTML only?

<meta http-equiv="Content-type" content="text/html; charset=charsetname">

However, I don't know how well browsers respect this.

I knew YOU would answer. :D