Pass "+" (plus sign) in flashvars

Today I have stuck with small problem, I tried in flashvars pass the value which contains "+", but in flash plus sign was converted in white space. The problem is quite strange, because I tried to pass special characters: ; / ? : @ $ , # - _ . ! ~ * ' ( ), everything was working fine. So, if you are going to pass + in flashvars, you need to convert it to %2b hex code.