SilverWave, Comment out the bg_pixmap line cause gnome-panel to use solid color, and it is different from panel_bg.png. Another way to just use solid color is change the Background from "None" to "Solid color" in Panel Properties.
SilverWave,
Comment out the bg_pixmap line cause gnome-panel to use solid color, and it is different from panel_bg.png. Another way to just use solid color is change the Background from "None" to "Solid color" in Panel Properties.