Here is another way of aproaching the A/D based on some code Melanie posted a long time ago, this uses direct access to the pics registers instead of using PBP's routines:

Code:
 Analog_In:
     ANSEL=%00110001
    ADCON0=%10000001;
        ' Enable ADC Module on pin AN0
    PauseUS 50;
        ' 50uS Pause to allow sampling Capacitor to charge
    ADCON0.1=1
    ' Start Conversion
    While ADCON0.1=1:Wend
    ' Wait for conversion to complete
    AnalogIn.Highbyte=ADRESH
    AnalogIn.Lowbyte=ADRESL
    ' Read 16-bit Result
RETURN
By changing ADCON0 to different values you should be able to read analog in on all the other analog pins