Macro writing - TrinketsFollow

Hey,

At the moment on my hunter I have 2 trinkets which (when used) do the same thing, give a 200 AP boost for 15 seconds.

What I have tried to develop was a macro which switched between them, to save an icon spot on my bars.

At the moment i just have:

/use 13
/use 14

This will use trinket 1 if available, and if it's on CD, will activate trinket 2.
Quick and dirty, but effective.
Problems with this macro include the fact that it only shows the icon / CD for trinket 1, and that it always pops an error that the item is not ready yet (as it would). If it pops trinket 1, trinket 2 is on CD, so errors. If trinket 2 is on CD, same msg.

Can anyone come up with a more ... umm... elegant solution? One that alternates icons, and does away with the 'not ready yet' msg?