This can be resolved by employing one of these three different methods.
Specifying the correct character set on the Content-Type http header.
For this, you would normally use a server-side scripting language like php. You can do it by adding the following piece of code to your php file. If you have a file that's included by all of the pages on your website then it would be wise to add it to that so it affects all of your pages.
header('Content-Type: text/html;charset=ISO-8859-1');
Using a meta tag in the head section of your document.
By adding a charset meta tag to your document you may be able to force the browser to switch the character-set that it uses when it's rendering the page. An example of this would be:
Note that the meta tag must appear entirely within the first 1024 bytes of the page.
Specifying a charset attribute on the script tag.
Personally, I've never used this method so I can't vouch for it. An example tag would be like this: