function rollNav(n, state) {
	classnameOff = (n.id.indexOf('sn_')!==-1) ? 'mainsitenavitem' : 'navitem';
	classnameHi = (n.id.indexOf('sn_')!==-1) ? 'mainsitenavitemover' : 'navitemover';
	linkcolorOff = (n.id.indexOf('sn_')!==-1) ? '#C2D5E2' : 'white';
	linkcolorHi = (n.id.indexOf('sn_')!==-1) ? 'white' : '#00ff00';
	
	//swap class of nav item container
	n.className = (state==1) ? classnameHi : classnameOff;
	
	//swap nav item link text color
	linkObj = document.getElementById(n.id+'_link');
	linkObj.style.color = (state==1) ? linkcolorHi : linkcolorOff ;
}