Dynamic baloon text

Hi =D
after a while away from flash ive decided to make a site for my pictures :wink:
im going to make a list of pictures and when the mouse scrolls over a picture i want some dynamic text to be displayed in a baloon.
incase you dont know what i mean by baloon:

except no close button and much prettier :wink:

the hard part is, and were i need your guyses help is…
how do i make it so the baloon rezises acording to how much text it needs to contain?

So to reiterate.
baloon comes up when i move mouse over a movie clip (easy enough)
balon contains text from a variabel ‘textVar’ (also pretty simple) :wink:
baloon is just big enough to contain the given text in the variable (…help!)
disapears when mouse out of area ( i can do that =P)

Thanks
//VoS