Dynamic Health Bar in unity 4.6

Hey so i need some help to create a health bar with the new UI system

i have a Variable called CurrentHealth which holds the health that the player has left. i want to display a heart for each health point the player has(like the minecraft hearts) and i need these hearts to expand out wards for the more health you have.

for example if i have 1 health left there will be one heart centered in the screen. if i have 2 health left the will be 1 heart either side of the center but there wont be any exactly centered. if i have 3 health left 1 heart will be centered and there will be 1 either side of that heart.

i would also like to be able to edit this at run time like this example

https://www.youtube.com/watch?v=ipdLXsrFuMY&list=PL7AE076AFAFD3C305#t=1420

thanks ~Scott