jump to place holder and mapping

[Fabian Braennstroem]

Hi,

I am trying 'vim' for a while now and actually like the
jumping to place holders indicated by '<++>' with 'C-j'. It
is very usefull, when you have small macro/abbreviations
including these place holders; e.g. in latex there exist a
macro:

\frac{<++>}{<++>}<++>

So you are able to complete quickly the fraction.

Furthermore, defining those 'macros' is pretty easy in vim
with the 'imap' funtion; so writing in insert-mode some
special shortcut, it expands to the wanted output with those
place holders. 

Does anybody have an idea how to achive this with emacs?
Maybe, there is even a package for that!?

Greetings, Fabian