Background image in CSS - How to use base_url() in a CSS file

[eluser]Juan Velandia[/eluser]
Hello, again a newbie question.

I'd like to know how can I use the base_url() whitin a CSS file? is this possible? or if I want to use a CSS style with a background I should do something like this?:

body{
padding:0px;
margin:0 auto;
background: url(http://example.com/system/application/vi...ground.jpg) 0 0 repeat-x;
}

Thanks a lot

Juan