images urls in produced output are not consistent

[ghost]

There are a couple of image paths in the produced output, for example:

background: url(sort-arrow-sprite.png) no-repeat 0 0;
background: url(assets/images/vertical-menu-submenu-indicator.png) right center no-repeat;
content: url(sprite_icons.png);

Better to use one location for all images, and document it in http://yui.github.com/skinbuilder/docs.html