[FireFox & innerHTML] or [document.write that doesn't wipe rest of page data]

[Disiance]

Alright, I have a frame and I want it to put text into the other frame. Now, there's two ways I can do it. I can use

parent.MyFrame.document.write ("data");

which wipes the rest of the page away or I can use
[CODE]parent.MyFrame.MyDIV.innerHTML =

parent.MyFrame.MyDIV.innerHTML + 'new text<BR>';

The first is undesirable because the entire page is wiped clean to insert the new text. The second won't work in FireFox. My question: Is there anyway to keep a document.write() from deleting the rest of the page, or is their an equivilent to the innerHTML property in FF?