hi. i dont know what the final adress of site will be, so i would like to use adress like ./rejestracja/index.php

ive made some buttons and i would like to make action getURL

Code:
on (release) 
{  
getURL('./rejestracja/index.php?adres=news.php', '_blank');  
}
gives me error "expecting a >>}<<". so how can i use getURL without http:// ?