Banner Dimensions:

button1 120x90
button2 120x60
full banner 468x60
haLF Banner 234X30
half page ad 300x600
large rectangle 336x280
leaderboard 728x90
medium rectangle 300x250
micro-bar 88x31
rectangle 180x150
skyscraper 120x600
square button 125x125
square pop-up 250x250
vertical banner 120x240
vertical rectangle 240x400
wide skyscraper 160x600