[Picture source: http://fc05.deviantart.net/fs32/i/2008/214/c/4/Joker__s_magic_trick_by_mollycarroll.jpg]
In the old days we need to use Photoshop and the like to remove objects. However the price of the software as well as the learning curve is a bit overkill for a simple task like this.
Here's a Free tool that allows you to remove any object just by highlighting it, magic? You bet. Note that this technology was introduced only recently in Adobe Photoshop CS5, not sure if the algorithm works differently but you'll get almost similar results using this Free tool :)