Is it possible to focus on a using JavaScript focus() function?

Answer 1

To make the border flash you can do this:

function focusTries() {
    document.getElementById('tries').style.border = 'solid 1px #ff0000;'
    setTimeout ( clearBorder(), 1000 );
}

function clearBorder() {
    document.getElementById('tries').style.border = '';
}

This will make the border solid red for 1 second then remove it again.