@INSERT[n, string1, string2]: Inserts string1 into string2 starting at
position n. The first position in the string is postion 0. For example,
%@insert[1,arm,wing] returns the string "warming".
Created using Inf-PHP v.2 (c) 2003 Yuri Prokushev
Created using Inf-HTML v.0.9b (c) 1995 Peter Childs