Okay, here's the scene:

You're standing in a crowded 4 star hotel lobby, leaning against the 10 ft fountain in the center. In your hand you are holding a javascript array with 5 items in it, the last of which has a null value. So you ask the little Firefox guy on your left shoulder to tell you how many items are in your array. He looks it over, sees that the last item has a null value, and so tells you that your array has 4 items in it. Then you turn to the little IE guy on your right shoulder and ask him the same question. He looks it over, sees that there are 5 items in the array, and reports back that indeed your array contains 5 items. So, you ask the little IE guy on your right shoulder to please fetch you the 5th item in your array, and he immediately vomits all over your good coat and tie, because for the LIFE of him, he can't find a fifth item in your array! Despite the fact that he emphatically stated there were definately 5 items in your array, he lacks the testicular fortitude to be able to fetch the sucker. Now, were you to ask the Firefox guy on your left shoulder to fetch you the fifth item, he would politely remind you that there is no fifth item. But does Bill's browser do that? NOOOOOoooooo, it just makes all the time you spent writing your javascript function a total waste, because now you have to go BACK into it and re-code the logic to account for the fact that Bill's browser is going to behave like a drunken, double-visioned sailor on his last night of shore leave. Don't you hate that? Why can't Bill's browser just conform? The alternative is to do your part to help kill BIll's browser; download Firefox today and set yourself free. I highly recommend it.
That's my rant for this evening.