Possible Duplicate:
CSS: url() - are quotes needed?
You can use this:
background-image: url("images/rock.png");
This:
background-image: url('images/rock.png');
And this:
background-image: url(images/rock.png);
What is the right way or is it just a preference? Does using ' ' " " make a difference? I hope my question makes sense. Thanks.