//made by Vytautas Ziukas 


    function Init(mode)


    {


        var numb1 = rand(10);


        var numb2 = rand(10);





        var numb3 = 0;


        var numb4 = 0;      


        var numb5 = 0;


        


        switch(mode)


        {


            case 'sum':


                var numb3 = numb1 + rand(10);


                var numb4 = numb2 + rand(10);        


                var numb5 = numb2 + rand(10);        


                answer = numb1 + numb2;


                break;


            case 'sub':


                sub1 = numb1 + numb2;


                var numb3 = numb2 + rand(10) - numb2;


                var numb4 = numb1 + rand(10) - numb1;        


                var numb5 = numb2 + rand(10) - numb2;   


                numb1 = sub1;     


                answer = numb1 - numb2;


                break;


            case 'mul':


                var numb3 = numb1 * rand(10);


                var numb4 = numb2 * rand(10);        


                var numb5 = numb2 * rand(10);        


                answer = numb1 * numb2;


                break;


            case 'div':


                if (numb1 == 0)


                    numb1 = 1;


                if (numb2 == 0)


                    numb2 = 1;








                div1 = numb1 * numb2;


                var numb3 = Math.round((rand(10) * rand(10) +1) / (rand(10)+1));


                var numb4 = Math.round((rand(10) * rand(10) +1) / (rand(10)+1));        


                var numb5 = Math.round((rand(10) * rand(10) +1) / (rand(10)+1));        


                numb1 = div1;


                answer = numb1 / numb2;


                break;


        }


        


        var sum1 = document.getElementById("sum1");


        var sum2 = document.getElementById("sum2");


        var sum3 = document.getElementById("sum3");





        var place = rand(3);


        sum1.innerHTML = place == 0 ? answer : numb3;


        sum2.innerHTML = place == 1 ? answer : numb4;


        sum3.innerHTML = place == 2 ? answer : numb5;





        var nr1 = document.getElementById("Nr1");


        nr1.innerHTML = numb1;


        


        var nr2 = document.getElementById("Nr2");


        nr2.innerHTML = numb2;





        div1 = document.getElementById("rt_col");


        div1.style.display = "none";            


        div1 = document.getElementById("rt_col2");


        div1.style.display = "none";


    }


    


    function selected( name )


    {


        msg = document.getElementById("message");


        div1 = document.getElementById("rt_col");


        div2 = document.getElementById("rt_col2");





        selAnsw = document.getElementById(name).innerHTML;


        if (selAnsw == answer)


        {


            div1.style.display = "";  


            div2.style.display = "none";           


        }


        else


        {


            div1.style.display = "none"; 


            div2.style.display = "";            


        }


    }


    


    function rand ( n )


    {


      return ( Math.floor ( Math.random ( ) * n ) );


    }