var OpenMenu = "";
var MenuOpen = 0;

function switchlayer(Layer_Name)
{
	if (MenuOpen == 1) {
		MenuOpen = 0;
		if (OpenMenu != Layer_Name) {
			switchlayer(OpenMenu);
		}
	}
	OpenMenu = Layer_Name;
	
	var GECKO = document.getElementById? 1:0 ;
	var NS = document.layers? 1:0 ;
	var IE = document.all? 1:0 ;

	if (GECKO) {
		if (document.getElementById(Layer_Name).style.display == 'block') {
			document.getElementById(Layer_Name).style.display = 'none';
			MenuOpen = 0;
		}
		else {
			document.getElementById(Layer_Name).style.display = 'block';
			MenuOpen = 1;
		}
	}
	else if (NS) {
		if (document.layers[Layer_Name].display == 'block') {
			document.layers[Layer_Name].display = 'none';
			MenuOpen = 0;
		}
		else {
			document.layers[Layer_Name].display = 'block';
			MenuOpen = 1;
		}
	}
	else if (IE) {
		if (document.all[Layer_Name].style.display == 'block') {
			document.all[Layer_Name].style.display = 'none';
			MenuOpen = 0;
		}
		else {
			document.all[Layer_Name].style.display = 'block';
			MenuOpen = 1;
		}
	}
}