Give up? Okay, select your object, press the I key and select Layer from the menu. Open the IPO window, and you will see the Layer IPO curve. Press TAB to get the curve into edit mode. Use Ctrl+left click to add another IPO key. Press the N key to input the numeric values-- X is the frame location and Y should be the Layer you want to use. This would be my approach at least, feel free to discover your own.
If you’re going to use the layer IPO window, and use N-Key to move the points, it turns out that the Y-value is not actually the layer it’s on, but the binary combination of the layers it’s on.
So if you wanted it to be visible on layers 4, 5 and 7, you would use a y value of 1011000 binary (the 4th, 5th and 7th bits are 1’s) which is 88.
In short, for layer 1 use 1, for layer 2 use 2, for layer 3 use 4, for layer 4 use 8, etc and for several layers add them up.
Thanks for the follow Phlip. I didn’t know that fact about the layer IPO. I just tried it a quick experiment from layer 1 to layer 2 to answer his question.