//john reeve did this

var navTimer = 0;
var delay = 500;
var currentLayer;
var currentKey = false;

isNS4 = (document.layers) ? true : false;
isIE4 = (document.all && !document.getElementById) ? true : false;
isIE5 = (document.all && document.getElementById) ? true : false;
isNS6 = (!document.all && document.getElementById) ? true : false;


function toggleLayer (toggleLayerName, toggleSwitch) {
	if (isIE5 || isNS6) {
		eval("document.getElementById('subnavBox_" + toggleLayerName +"').style.visibility='" + toggleSwitch + "'"); 
	}
	else if (isIE4) {
		eval("document.all['subnavBox_" + toggleLayerName +"'].style.visibility='" + toggleSwitch + "'"); 
	}
	else {
		if (toggleSwitch == "hidden") { toggleSwitch = "hide"; }
		else { toggleSwitch = "show"; }
		eval("document.layers['subnavBox_" + toggleLayerName +"'].visibility='" + toggleSwitch + "'"); 
	}
}

//navOver initiated by mouseOver on nav image
function navOver(layerName) { 
	clearTimeout(navTimer); //clear any leftover timers
	if (currentLayer != null) { // turn off old layer right away if it's on
		toggleLayer(currentLayer,'hidden');
		changeImages('nav_' + currentLayer, 'nav_' + currentLayer + '_off');
	}
	currentLayer = layerName; //remember the old layer for the next round
	toggleLayer(layerName,'visible');
	changeImages('nav_' + layerName, 'nav_' + layerName + '_on');
}

//navOut initiated by mouseOut of nav image
function navOut(layerName) {
	offLayer = "turnOff('" + layerName + "');";
	navTimer = setTimeout(offLayer, delay);
}

//subNavOver initiated by mouseOver on subnav layer (resets timer)
function subNavOver(layerName) {
	clearTimeout(navTimer);
}

//turnOff initiated by navOut function
function turnOff(layerName) {
	toggleLayer(layerName,'hidden');
	changeImages('nav_' + layerName, 'nav_' + layerName + '_off');
}