since u r using dreamweaver then i assume u have fireworks too. just open up the image and resize it to a convenient size(64*64 maybe) and also reduce the image quality as this will reduce the no of bytes it consumes. If u have a bunch of thumbnails this will really help your page loading time. I would have suggested just using <img width='XXX'> to modify the size but then this doesnt present a gains as far as bandwidth is concerned.