Call _setupDOMDivider when necessary only
Call _setupDOMDivider when necessary only

Previoulsy, the backgroundColor and url css properties where set at
each drawing pass.

cappuccino/cappuccino,cappuccino/cappuccino,Rosch/cappuccino,Rosch/cappuccino,Rosch/cappuccino,enquora/cappuccino,enquora/cappuccino,daboe01/cappuccino,Rosch/cappuccino,daboe01/cappuccino,enquora/cappuccino,daboe01/cappuccino,daboe01/cappuccino,enquora/cappuccino,cappuccino/cappuccino,daboe01/cappuccino,Rosch/cappuccino,cappuccino/cappuccino,daboe01/cappuccino,Rosch/cappuccino,enquora/cappuccino,enquora/cappuccino,enquora/cappuccino,daboe01/cappuccino,cappuccino/cappuccino,Rosch/cappuccino,cappuccino/cappuccino,cappuccino/cappuccino