//fade in/out menu
var timeout = 10;

ie5  = (document.all && document.getElementById);
ns6 = (!document.all && document.getElementById && !window.opera);
opera = (window.opera ||(window.opera && window.getSelection));

opac = 0;
current_menu = "";

function show_hide(div_id){
	if ((current_menu != "") && (div_id != current_menu))
	{
		document.getElementById(current_menu).style.display = "none";
	}
	opac = 0;

	show_hide_aux(div_id);
}

function show_hide_aux(div_id){		
	if (current_menu != div_id)
	{
		id = document.getElementById(div_id);
		opac = 0;
		if (!opera){fade_in(div_id);}
		if (opera && window.getSelection){id.style.opacity = 1;}
		id.style.display = "block";
	}
	current_menu = div_id;
}

function fade_in(div_id) {
	if(opac < 100){
		opac += 5;
		if(ie5) {document.getElementById(div_id).filters.alpha.opacity = opac;}
		if(ns6) {document.getElementById(div_id).style.MozOpacity = opac/100;}
		setTimeout('fade_in("' + div_id + '")', timeout);
	}
}
function show_current(div_id)
{	
		id = document.getElementById(div_id);
		if (id)
		{	
			opac = 100;
			if (!opera){
				if(ie5) {id.filters.alpha.opacity = opac;}
				if(ns6) {id.style.MozOpacity = opac/100;}
			}
			if (opera && window.getSelection){id.style.opacity = 1;}
			id.style.display = "block";
			current_menu = div_id;
		}
}