function vc_gid(id){
	var ret_id;
	if(ret_id = document.getElementById(id)){
		return ret_id;
	}
	else{
		return false;
	}
}

//alert(document.getElementById('b_menu_block'));

if( (vc_gid('a_menu_main_vc')) && (vc_gid('b_menu_main_vc'))){
	vc_gid('a_menu_main_vc').innerHTML = vc_gid('b_menu_main_vc').innerHTML;
	vc_gid('b_menu_main_vc').innerHTML = '';
}

if( (vc_gid('a_menu_block')) && (vc_gid('b_menu_block'))){
	var menu_txt = document.getElementById('b_menu_block');
	if(menu_txt.innerHTML!=''){
		vc_gid('a_menu_block').innerHTML = vc_gid('b_menu_block').innerHTML;
		vc_gid('b_menu_block').innerHTML = '';
	}
}