var gNavTabs = [], gNavContents = []
	var gGecko  = (navigator.userAgent.indexOf("Gecko") != -1)
	var gMacIe5 = (navigator.platform == "MacPPC" && navigator.appName == "Microsoft Internet Explorer" && document.getElementById)

	function showNavTab(num) {
		gNavTabs[1].s.visibility = (num == 1 ? "visible" : "hidden")
		gNavTabs[2].s.visibility = (num == 2 ? "visible" : "hidden")
		gNavContents[1].s.visibility = (num == 1 ? "visible" : "hidden")
		gNavContents[2].s.visibility = (num == 2 ? "visible" : "hidden")
	}
	function initTabs() {
		gNavTabs[1] = getLayer("navTabs1")
		gNavTabs[2] = getLayer("navTabs2")
		gNavContents[1] = getLayer("content1")
		gNavContents[2] = getLayer("content2")
	}
	function getLayer(sLyrName) {
		var o
		if (document.all) o = document.all[sLyrName]
		else if (document.getElementById) o = document.getElementById(sLyrName)
		else if (document.layers) o = getNsLayer(sLyrName)
		
		if (o) {
			o.s = o.style ? o.style : o
			return o
		} else {
			return 0
		}
	}
	function getNsLayer(sLyrName, doc) {
		if (!doc) doc = window.document
		if (doc.layers) {
			for (var i = 0; i < doc.layers.length; i++) {
				if (doc.layers[i].id == sLyrName) return doc.layers[i]
				else if (doc.layers[i].document.layers.length > 0) {
					var o = getNsLayer(sLyrName, doc.layers[i].document)
					if (o) return o
				}
			}
		}
		return 0
	}