i know that liquid
but i mean i wanted to know if i can change more tiles in one code so i don't have to copy and paste a million times
but now i tried this and it worked

board[this.x+this.y*64]=tilex+tiley*16;
updateboard this.x,this.y,1,1;

now add a timeout out and stuff and you're done...
please correct me if i'm wrong..