Polish and Hungarian to HTML character converter

As some of you may already know, I'm maintaining www.lengyel13.hu, a website that has mixed, Polish and Hungarian text. Both of these languages use special characters and as such, when you add them to a website, you will have to use their ASCII equivalent in your HTML code, otherwise some browsers might not interpret them correctly. For long time I have done this change to the original text manually in HTML using the find and replace function of my HTML editor, however this took a considerate amount of my valuable time, and I was sure there has to be another way, so I came up with this idea: why don't I create a Polish and Hungarian to HTML character converter myself?