I hope, and believe, that when sensible browser-makers start to dominate the market (and they are gaining), we will get a de facto standard, and this problem will go away.

Well, you probably won't even have to wait that long. I have found that over the last few years, (for example) starting with the first incarnations of Mozilla and MSIE5.5, that it's actually quite easy to make quite complex code in Javascript that just works across browsers — thus, without using any browser specific code. It really is a lot better already than it used to be in the 3.x/4.x days.