var old='';

function menu(name)
{
submenu=eval("submenu_"+name+".style");
		if(old!=submenu)
	{
		if(old!='')
		{
			old.display='none';
		}
		submenu.display='block';
		old=submenu;
	}
	else
	{
		submenu.display='none';
		old='';
	}
}