How do I hide a multi-select Customfield using javascript?

[Smruti Panda]

The entire HTMLdivElement is desired to be hidden. I am able to get only the options and hide them.

For ex.

var x=document.getElementById('customfield_10001-1').parentNode;

x.style.display='none';

Is there anything similar for the entire multi select div element?

[JamieA]

AJS.$("#customfield_10001").closest('div.field-group').hide()