Adding content to DOM tree on the fly

Hello!

I want to add dynamic content to the DOM tree of a webpage, e.g. a 
simple text into a table cell but also more complex stuff.

How do I do this? I tried to use LazyHTMLElement but it doesnt work for 
my... Does anybody have to short code snippet which shows how to add 
dynamic stuff to a Node?

Please reply also to my email address because I read this mailing list 
only on www.enhydra.org and the postings views there are delayed.

Thank you in advance