Checking for document.getElementById() means full DOM support?

[Mike Kypriotis]

I want to create some nodes and insert them into my page just doing a

if (document.getElementById)

is enough? or should I also use

if (!document.appendChild || !document.createTextNode) return;

as well as checks any further DOM commands like

document.getElementById("banner_rotator_content").childNodes[0].nodeValue

?

[Dormilich]

these commands are so basic, that you need a really old/weird browser (like NN4) to not have support nowadays (any decently modern browser supports the DOM base API).