Dead space ads

I tend to have a lot of windows open at a time.  I also use the mouse wheel and arrow keys a lot to scroll.  This has caused problems lately for me.  You must change focus to the "component" that you want to scroll before you can use the mouse wheel or the arrow keys.  For web browsers, this usually means clicking on some dead space on the webpage.  Unfortunately, advertisers have started putting ads in the dead space.  Normally, these ads are barely visible.  When someone clicks on the dead space, though, these ads either pop up or take control of the page that I'm trying to use.  This pattern has been happening for a while now, but it seems to occur much more frequently now.  For most pages, you can get around this by clicking on the scroll bar itself.  This becomes much harder on websites that make use of frames, but hide the scrollbar.