Hex2Dec()

         Converts a hexadecimal string into a decimal number

    Syntax:

         Hex2Dec ( cHex ) -> nDec

         cHex : The hexadecimal string to be converted.

    Description:

         Converts a string in hexadecimal base into a integer in
         decimal base.

    Return:

         The decimal integer.

    Example:

         ? Hex2Dec ( "FA" )