Advertisement in sidebar

Hi, I would like to use Google Adsense ads on my website, in the right sidebar. I already found your widget for ads, and saw that I can insert the code there. But my question is now: does the sidebar automatically adjust to the size of the ad? I would like to use 160x600 px ads, and would not like to have a lot of space on the left and right of the ad, so that the content has more space. Thanks for your help!