var active_menu = 'o_programie';

$(document).ready(function() {
	$("div.main_menu a").mouseover(function() {
		var old_a_name = "a#" + active_menu;											
		var old_div_name = "div#menu_" + active_menu;
		var new_div_name = "div#menu_" + $(this).attr("id");

		$(old_a_name).parent().removeClass("current");
		$(this).parent().addClass("current");
		$(old_div_name).hide();
		$(new_div_name).show();

		active_menu = $(this).attr("id");
	});
	
	var div_name = "div#menu_" + active_menu;
	var a_name = "a#" + active_menu;
	$(a_name).parent().addClass("current");
	$(div_name).show();
});