function plusMenu(item, imgBase) {
	if(document.getElementById('navSub'+item).style.display == 'none'){
		document.getElementById('navSub'+item).style.display = 'block';
		MM_swapImage('plusImg'+item,'',imgBase+'close.gif',1);
	}
	else {
		document.getElementById('navSub'+item).style.display = 'none';
		MM_swapImage('plusImg'+item,'',imgBase+'open.gif',1);
	}
}