Try this...don't know if it'll work or not, but it should put a value on your LCD that matches the A/D result register, assuming you have something wired to PortA.0, like the wiper of a pot, with +5v on one side and ground on the other...
Code:
@ DEVICE pic16F877 
@ DEVICE pic16F877, WDT_on 
@ DEVICE pic16F877, PWRT_ON 
@ DEVICE pic16F877, PROTECT_OFF 
@ DEVICE pic16F877, HS_OSC 
DEFINE LCD_DREG PORTB 
DEFINE LCD_DBIT 0 
DEFINE LCD_RSREG PORTE 
DEFINE LCD_RSBIT 1 
DEFINE LCD_EREG PORTE 
DEFINE LCD_EBIT 0 
DEFINE LCD_RWREG PORTE 
DEFINE LCD_RWBIT 2 
DEFINE LCD_BITS 8 
DEFINE LCD_LINES 2 
DEFINE LCD_COMMANDUS 1000 
DEFINE LCD_DATAUS 225 
raw var word : trisa=1 : trisb=0 : trise=0 : adcon0 = $c1 : adcon1 = $ce
main:     adcon0.2 = 1   'start A/D conversion
wait_for_it:     if adcon0.2 = 1 then wait_for_it     'wait for A/D to finish
raw.highbyte = adresh : raw.lowbyte = adresl
lcdout $fe , 1 , DEC4 raw : goto main
END