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='';  
	}  
}