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I would suggest changing the following CSS rule:
div#menu a:hover {
border-bottom: 3px solid #FF5A00;
padding-bottom: 0;
}
into:
div#menu a:hover, div#menu a.active {
border-bottom: 3px solid #FF5A00;
padding-bottom: 0;
}
This would make primary links highlighted when active. A simple change which dramatically improve menu usability.