var old='';

function menu(name){
	if(name != 0){
		submenu=eval("sub"+name+".style");
		if(old!=submenu){
			if(old!=''){
				old.display='none';
			}
			submenu.display='block';
			old=submenu;
		}else{
			submenu.display='none';
			old='';
		}
	}	
}