function menuActivate (menuID,menuAdj) {
	imgSwap('nav_' + menuID, 'nav_' + menuID + '_hot');
	screenwidth = document.body.clientWidth;
	screenhalf = screenwidth / 2;
	menuLeft = screenhalf - menuAdj;
	document.getElementById('menu_' + menuID).style.left = menuLeft + 'px';
	document.getElementById('menu_' + menuID).style.visibility='visible';
}

function menuDeactivate (menuID,menuState) {
	imgSwap('nav_' + menuID, 'nav_' + menuID + '_' + menuState);
	document.getElementById('menu_' + menuID).style.visibility='hidden';
}

function imgSwap(imgID,imgNew) {
  document.getElementById(imgID).src='i\/' + imgNew + '.gif';
}

function menuOff(menuID) {
  document.getElementById(menuID).style.visibility='hidden';
}