funkce v v cyklu

function div(){
    
    var f = document.getElementById("pocetlidi").value;
        for (var i=1; i<=f;i++){
            var divy = document.createElement("div");
            var divy2 = document.createElement("div");
            var br = document.createElement("br");
            
            divy.style.width = "100px";
            divy.style.height = "auto";
            divy.style.background = "red";
            divy.style.color = "white";
            divy.id = "divy" + i
            divy.innerHTML = "Hello";
            divy.onclick = function ahoj (){
                for(var b = 1; b<=f; b++){
                document.getElementById("divy2"+b).style.visibility = "visible";
          

                }                    }


            
            
            
            divy2.style.width = "200px";
            divy2.style.height = "auto";
            divy2.style.background = "green";
            divy2.style.color = "white";
            divy2.id = "divy2" + i
            divy2.innerHTML = "Hello2";
            divy2.style.visibility = "hidden";
            
            
            
        document.body.appendChild(divy);
        document.body.appendChild(divy2);
        
}
    document.getElementById("pocetlidi").readOnly = true;