topNavActive = -1;navArraySize = 6;

function navon(idnum) {
	divClassChange('#roll'+idnum,'rollover_section');
	divClassChange('#rollnav'+idnum,'navsifr navsifr_top rollover_top');
	//refreshSIFR();
	navoff(idnum);
	return true;
}

function navoff(idnum) {
	for (i=0;i<navArraySize;i++) { 
		if (i!=idnum) { 
			divClassChange('#roll'+i,'rollover_section display_none');
			if (i!=topNavActive) divClassChange('#rollnav'+i,'navsifr navsifr_top');
		}
	}
	return true;
}