*
* PARAMETERS
* `compare' The function-pointer `compare' is used to compare two keys. It
- * has to return less than zero if it's first argument is smaller
+ * has to return less than zero if its first argument is smaller
* then the second argument, more than zero if the first argument
* is bigger than the second argument and zero if they are equal.
* If your keys are char-pointers, you can use the `strcmp'