Well, you can disable the arrows by changing this setting inside the .js file:
Code:
arrowpointers:{
downarrow: ["ddlevelsfiles/arrow-down.gif", 11,7], //[path_to_down_arrow, arrowwidth, arrowheight]
rightarrow: ["ddlevelsfiles/arrow-right.gif", 12,12], //[path_to_right_arrow, arrowwidth, arrowheight]
showarrow: {toplevel: true, sublevel: true} //Show arrow images on top level items and sub level items, respectively?
},
As far as centering the menu text, do you mean center the entire top menu relative to the page? If so, the easiest way is just to pick a menu theme that does not use CSS floats, such as "Chrome Menu", "Shade Tabs", and a couple of others on the Menu Generator page (look at the corresponding description).
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