Snippet of text: Extension

Hey Guys.
Is there an extension that will allow the following.

Type [jugglinballs]
And in the front it's replaced with save html block.

ie.
Block of text assigned to [jugglingballs]
-They are round.
-130grams.
-Perfect to learn juggling.
<IMG HERE>

Then in descriptions type the following
These juggling balls have the following feature.
[jugglingballs]


Displayed in front end.

These juggling balls have the following feature.
-They are round.
-130grams.
-Perfect to learn juggling.
<IMG HERE>


Cheers