var isIE4;
var isNav4;
var isNav6;

// Determine which browser is used

function setbrowser() {
	if (navigator.appVersion.charAt(0) == "4") {
		if (navigator.appName.indexOf("Explorer") >= 0) {
			isIE4 = true;
		}
		else {
			isNav4 = true;
		}
	}
	else if (navigator.appVersion.charAt(0) > "4") {
		isNav6 = true;
	}

}

setbrowser();

function showLayer(layerName){
	if (isNav4) {
		n_layer = document.layers[layerName];
	}
	else if (isIE4) {
		n_layer = document.all(layerName).style;
	}
	else if (isNav6) {
		n_layer = document.getElementById(layerName).style;
	}
	
		n_layer.visibility="visible";
}

function hideLayer(layerName){
	n_layer = null;
	if (isNav4) {
		n_layer = document.layers[layerName];
	}
	else if (isIE4) {
		n_layer = document.all(layerName).style;
	}
	else if (isNav6) {
		n_layer = document.getElementById(layerName).style;
	}
	
	if(n_layer != null) {
		n_layer.visibility="hidden";
    }
}

// menu
	var current_popup     = "";
	var current_root      = "";
	var current_secondary = "";
 
	function entersub(n,root) {
		wm_switch(root,'on');
		current_root = root;

		var layer_id = n;
		showLayer(n);
		current_popup=n;
	}
                 
	function leavesub() {
		wm_switch(current_root,'off');
		if(current_popup != ""){
			var layer_id = current_popup;
			hideLayer(layer_id);
		}
	}