Hide an element's next sibling with Javascript

Question

I have an element grabbed from document.getElementById(\'the_id\'). How can I get its next sibling and hide it? I tried this but it didn\'t work:

Answer 1

Firebug error was elem.nextSibling.style is undefined.

because nextSibling can be a text-node or other node type

do {
   elem = elem.nextSibling;
} while(element && elem.nodeType !== 1); // 1 == Node.ELEMENT_NODE
if(elem) elem.style.display = 'none';