function smddChangeMenu(top_id,bottom_id){
   var top = document.getElementById(top_id);
   var bottom = document.getElementById(bottom_id);
	if (bottom.style.visibility == 'visible'){
		bottom.style.visibility = 'hidden';
		top.className = 'small_drop_down_top_off';
	}
	else {
		bottom.style.visibility = 'visible';
		top.className = 'small_drop_down_top_on';
	}
}