canvas.js

function askH(){

        artisan.drawCircle('canvas', 250, 300, 120, 'rgb(255, 0, 0)');
        artisan.drawText('canvas', 146, 250, 'O n atomico deste elemento e 1.', '#FFFFFF');
        artisan.drawText('canvas', 180, 280, 'Quantos eletroes tem?', '#FFFFFF');

        $('#atomnum').fadeIn('fast');

        var ans = 0;

        $('#atomnum').change(function(e) {
            var ans = $('#atomnum').val();

            if(ans == '1') {
                artisan.drawText('canvas', 200, 300, 'Correto!', '#FFFFFF');
            }
            else {
                e.preventDefault();
            }
        });

    }