How to make a DIV visible and invisible with JavaScript

Question

Can you do something like

function showDiv()
{
    [DIV].visible = true;
    //or something
}

Answer 1

Make Invisible using CSS

#div_id {
        /*height: 400px;*/
         visibility:hidden;
    }

Make Visible using Javascript

document.getElementById('div_id').style.visibility = 'visible';