Ok, thanks.

But it still dosent work as I want it :/

Code:
@   device  pic16F648A, hs_osc, wdt_off, mclr_on, lvp_off, protect_off
DEFINE OSC 20

LED1 var PORTB.1
PRESS var PORTA.1
CMCON=7


loop:

If press=1 then       
            high led1  
            else
            low led1  
            endif      
            goto loop   
            end
When i transfer it LED1 starts to shine directly even if PortA.1 doesnt have +5V

:/