When using loaders for all the images...

A question about programing style:
I'm making an image gallery and am loading about a dozen thumbs that load a larger image when each one is clicked. Works just great so far. But, as expected, there's a little pause before each corresponding large image is displayed.
I'd like to eliminate the wait, if possible, so here's my question: As a matter of preference or programing style, whatever you want to call it, do you guys usually load ALL the images first, thumbnails as well as large images, before displaying anything on the stage? Or do you just load each large image when necessary, after its corresonding thumbnail is clicked?
Sometimes I see very cool Flash sites that have the percentLoaded line or twirler displayed for what seems like a long time, but then each screen (MovieClip) after that displays fairly quickly and I'm wondering if that's what's happening - all, or at least a LOT of the images are being preloaded.
I've learned a bunch from you guys by asking my /*stupid*/ questions in this forum and I appreciate the help. I've still got a long way to go, though.
THANKS for the advice.

thumbnails, if they have small file sizes, i load sequentially (so they look nice as they're being displayed one-by-one).  large images i load with a preloader display at the time the thumbnail is clicked.
background preloading of large images i don't do unless the client specifically requests it because it's more work to do and generally doesn't add a lot, in my opinion.

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