More about urlencode and urldecode

What you want is possible but it is considerably more work that it is practical to put in. Just say decode and let PHP do the calculations
Anyway, thanks for an interesting question. Researching it taught me about both how UTF-8 works and about URL encoding in general.
First, link to an explanation of URL [...]

Nasty TinyMCE Error

There is a nasty tinyMCE error in Firefox that made my life a living hell.
First it was hard to track when it happened. Mostly when using tinyMCE in tabbed displays. I thought the two JavaScript libraries did not “support” each other. or maybe some weird variable they use together.
the error was visible in firebug (or [...]