I use Ad-Block Plus with Fire Fox which blocks ads and pop-ups. I've noticed that it even blocks advertisements that are inside of embedded Flash, like on Youtube for instance. I know that Ad-Block plus removes HTML entities from the web-page and this can be also done with javascript. But how...
You need to resize the image manually with an external program, or you could use a dynamic image with an image.php and change the background to:
url(image.php?src=image.png&width=30&height=60)
source of the image.php
<?php
$image = imagecreatefrompng($_GET['src']);
list($width, $height) =...