function menuItemHover(id, visible){
	var arrow, item;

	switch(id){
	case 1: arrow = 'menu_servises_arrow'; item = 'menu_servises'; break;
	case 2: arrow = 'menu_news_arrow'; item = 'menu_news'; break;
	case 3: arrow = 'menu_carreers_arrow'; item = 'menu_careers'; break;
	case 4: arrow = 'menu_about_arrow'; item = 'menu_about'; break;
	}
	if(visible == 1){
		
		$('menu_servises_arrow').style.visibility = 'hidden';
		$('menu_news_arrow').style.visibility = 'hidden';
		$('menu_carreers_arrow').style.visibility = 'hidden';
		$('menu_about_arrow').style.visibility = 'hidden';

		$('menu_servises').style.visibility = 'hidden';
		$('menu_news').style.visibility = 'hidden';
		$('menu_careers').style.visibility = 'hidden';
		$('menu_about').style.visibility = 'hidden';	

		
		$(arrow).style.visibility = 'visible';
		$(item).style.visibility = 'visible';
	}
	if(visible == 0){
		$(arrow).style.visibility = 'hidden';
		$(item).style.visibility = 'hidden';
	}

}