Displaying a "loading" image while waiting on RPC

Hey all.  This is my first post to the group.  I've got a little GWT/
App Engine web app (at nicksmap.org) I've whipped up that maps New
York area craigslist rental listings (yeah, I know, others have done
it already, but all of the other implementations miss A LOT of
listings and have no flagging features...so I thought there was room
for me to go ahead and try to do it right).  I've got an RPC that gets
called every time a user drags a map.  This function (er....method)
provides data that is then used to populate the map with markers and
correspnding infowindow content.  Because of the sheer number of
listings I am dealing with, the RPC can often take a few seconds to
deliver all of its data, during which time it looks to the user like
nothing is happening.  I would like to be able to display a loading
icon during this time.  I'm sure that this is a pretty trivial thing
to do -- I'm just not sure how to do it, so thought I should ask the
group.
Thanks,
Nick Zaillian

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