function menu(Layer_Name,type) {
	var GECKO = document.getElementById? 1:0 ;
	var NS = document.layers? 1:0 ;
	var IE = document.all? 1:0 ;
	if (type=='visible') {
		if (GECKO) {
			document.getElementById(Layer_Name).style.display='block';
		} else if (NS) {
			document.layers[Layer_Name].display='block';
		} else if (IE) {
			document.all[Layer_Name].style.display='block';
		}
	} else {
		if (GECKO) {
			document.getElementById(Layer_Name).style.display='none';
		} else if (NS) {
			document.layers[Layer_Name].display='none';
		} else if (IE) {
			document.all[Layer_Name].style.display='none';
		}
	}
}