In your HTML, add this meta tag:
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
Also add this PHP header at top of the script:
header("Content-Type: text/html;charset=UTF-8");
[EDIT]:
One more tip is to save the file as UTF-8 without BOM
encoding. You can use Notepad++ or any decent editor to do that.