Show different arrow images for arrow up/down in jscrollpane

I need to show two different images for the arrow up and arrow down in a js开发者_运维技巧crollpane. In CSS I can set only one background for the arrows. How can I show two different images?

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You can see up and down arrows used on the Lozenge theme here: http://jscrollpane.kelvinluck.com/themes/lozenge/

That uses a sprite sheet of icons (from the jQuery UI themes). If you want to use two separate images then you can simply style the .jspArrowUp and .jspArrowDown classes.