var isNS4 = false;
var isIE4 = false;
var isW3C = false;
var displayNav = "";
var toggle = false;
	
if (document.layers) {  // NS 4 proprietary DOM
	isNS4 = true;
	docObj = "document.";
	styleObj = "";
	}
else if (document.all && !document.getElementById) { // IE 4 proprietary DOM
	isIE4 = true;
	docObj = "document.all.";
	styleObj = ".style";
	}
else if (document.getElementById && document.all) { // W3C standards-compliant DOM
	isW3C = true;
	docObj = "document.getElementById('";
	styleObj = "').style";
	}
else if (document.getElementById) { // W3C standards-compliant DOM
	isW3C = true;
	docObj = "document.getElementById('";
	styleObj = "').style";
	}