var menu_about_h = 0;
function menu_about(s)
{	
	var div = document.getElementById("about");
	if(typeof(div)=='undefined' || typeof(div.style)=='undefined') return false;
	if(typeof(div.style.visibility)=='undefined' || div.style.visibility == '') div.style.visibility = 'hidden';
	if(s==2)
	{
		div.style.visibility = 'visible';
		if(typeof(menu_about_h)!='undefined') clearTimeout(menu_about_h);
		menu_about_h = setTimeout("menu_about(3)", 1000);
		return true;
	}
	if(s==3) {div.style.visibility = 'hidden'; return true;}
	if(div.style.visibility == 'hidden' || s==true)
	{
		div.style.visibility = 'visible';
	}else{
		div.style.visibility = 'hidden';
	}
	return true;
}