I just use: images/yourstyname/whatever.png
That blows up, when you consider integrating into Joomla, so i use ../styles/images for compatibility and it actually working
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Linky Poo™you can also make your own there, by just filling in 2 colors, a radius and name it..
no images necessary too..
Linky Poo2™ -- this is a solution with an image.. generates it for you