[jQuery] Css icon image in tree jquery plugin

[jQuery] Css icon image in tree jquery plugin


File: jquery.treeview.css
Hi,
i would like to modify the css to visualizze other bigger icon of 30px
height 30px width; I know i have to add the path and the image in
this way
.filetree span newclass {background: url(images/image.gif) 0 0 no-
repeat;}
but i would like to visualizze them bigger.
Do you know?
Thanks