// floor je zaokrouhleni dolu, random nahodne cislo, * - pocet poloyek roz=17; index = Math.floor(Math.random()*roz); index2 =index2 = Math.floor(Math.random()*roz); while (index==index2) { index2 = Math.floor(Math.random()*roz) }; document.write(""); document.write(""); document.write("");