function setNavActive(navID,subnavID){
	var NavAnchors = document.getElementById('main-nav').getElementsByTagName('a');
	for(var i=0;i < NavAnchors.length; i++){
	  NavAnchors[i].className='';
	}
	var lnk = document.getElementById('nav-section'+navID)
	if(!lnk)return;
		lnk = document.getElementById('nav-section'+navID).getElementsByTagName('a')[0];
		lnk.className= 'active';	
	var sublnks =  document.getElementById('sub-section'+navID);
	if(!sublnks){return;}
		sublnks.style.display = 'block';
		sublnks = document.getElementById('sub-section'+navID).getElementsByTagName('a')[subnavID];
	if(!sublnks){return;}
		sublnks.className = 'active';
}
function setsubNavActive(navID){
	var lnks = document.getElementById('sub-nav').getElementsByTagName('a');
	for(var i=0;i < lnks.length; i++){
	  lnks[i].className='';
	}
	document.getElementById('sub-nav').getElementsByTagName('a')[navID].className = 'active';
}