Hiding a button in Javascript

visibility="hidden"

is very useful, but it will still take up space on the page. You can also use

display="none"

because that will not only hide the object, but make it so that it doesn't take up space until it is displayed. (Also keep in mind that display's opposite is "block," not "visible")

Something like this should remove it

document.getElementById('x').style.visibility='hidden';

If you are going to do alot of this dom manipulation might be worth looking at jquery

You can set its visibility property to hidden.

Here is a little demonstration, where one button is used to toggle the other one:

<input type="button" id="toggler" value="Toggler" onClick="action();" />
<input type="button" id="togglee" value="Togglee" />

<script>
    var hidden = false;
    function action() {
        hidden = !hidden;
        if(hidden) {
            document.getElementById('togglee').style.visibility = 'hidden';
        } else {
            document.getElementById('togglee').style.visibility = 'visible';
        }
    }
</script>