Can I pass the button ID dynamically?

```
$('#Button1').focus(function () {
        if (document.getElementById('HiddenVal').value != null && document.getElementById('HiddenVal').value != '') {
            $('#txtbox1').val(document.getElementById('HiddenVal').value);
            $('#Button1', window.parent.document).css("background-color", "#fcc63b");
            document.getElementById('HiddenVal').value   = '';
        }
    });

```

Here I want to pass the button ID dynamically instead of using `$('#Button1')`.

Can I use that?