LogX()

         Returns the logarithm in any base

    Syntax:

         LogX( nNumber, nBase ) -> nLogNumber

         nNumber : The number to calculate the logarithm from.
         nBase   : The logarithms base.

    Description:

         Returns the logarithm in the specified base.

         See the function Log10().  It is a separate function because
         you would most likely use base 10.

    Return:

         The logarithm in the specified base or Nil if negative number.

    Example:

         LogX( 10, 10 )    //  1