Kae Verans has written up a handy snippet of code to try to mimic the innerHTML property that Javascript lets you have access to.

DOM does not officially have an innerHTML parameter, but it’s incredibly useful. I found a need for something similar when working on some DOM stuff, so had to write a version.

Technically it's an "outerHTML" not inner, but it works about the same. The code and an example of its use is included.