Maybe the title says enough, but this is my problem

I've got an <iframe> on my page with some information: some pictures from calenders with a few buttons, which are a little bit wider than my <iframe>. The page is centered on the pictures, so the buttons are going out of the frame at the left and the right side. I could fix this problem with overflow: visible;, but than the information at the top and the bottom side is shown as well. How do I make the overflow:visible; just apply to the left and the right side, so that the top/bottom information outside the frame is still hidden?