var timeoutId, timeoverId;

$(document).ready(function(){
	  $("#menu_btn_1").mouseover(function () {    
	 timeoutId = setTimeout(back_z, 500);
	  clearTimeout(timeoverId);
    });
	
	 $("#menu_btn_1").mouseout(function () {
	 timeoverId = setTimeout(go_z, 500);
	  clearTimeout(timeoutId);
    });
	 $("#menu_btn_2").mouseover(function () {    
	 timeoutId = setTimeout(back_x, 500);
	  clearTimeout(timeoverId);
    });
	
	 $("#menu_btn_2").mouseout(function () {
	 timeoverId = setTimeout(go_x, 500);
	  clearTimeout(timeoutId);
    });
	 $("#menu_btn_3").mouseover(function () {    
	 timeoutId = setTimeout(back_c, 500);
	  clearTimeout(timeoverId);
    });
	
	 $("#menu_btn_3").mouseout(function () {
	 timeoverId = setTimeout(go_c, 500);
	  clearTimeout(timeoutId);
    });
	 $("#menu_btn_4").mouseover(function () {    
	 timeoutId = setTimeout(back_v, 500);
	  clearTimeout(timeoverId);
    });
	
	 $("#menu_btn_4").mouseout(function () {
	 timeoverId = setTimeout(go_v, 500);
	  clearTimeout(timeoutId);
    });
	 $("#site_navigation").mouseover(function () {	 
	 	$("#content_menu").css("display","block");
	  });
	 $("#site_navigation").mouseout(function () {    
	 	$("#content_menu").css("display","none");
    
    });
 });
 function go_z() { $("#menu_tab_1").css("display","block"); $("#menu_tab_2").css("display","none"); $("#menu_tab_3").css("display","none"); $("#menu_tab_4").css("display","none"); }
 function go_x() {  $("#menu_tab_1").fadeOut(500); $("#menu_tab_1").css("display","none"); $("#menu_tab_2").css("display","block"); $("#menu_tab_3").css("display","none"); $("#menu_tab_4").css("display","none"); }
 function go_c() {  $("#menu_tab_1").fadeOut(500); $("#menu_tab_1").css("display","none"); $("#menu_tab_2").css("display","none"); $("#menu_tab_3").css("display","block"); $("#menu_tab_4").css("display","none"); }
 function go_v() {  $("#menu_tab_1").fadeOut(500); $("#menu_tab_1").css("display","none"); $("#menu_tab_2").css("display","none"); $("#menu_tab_3").css("display","none"); $("#menu_tab_4").css("display","block"); }

function back_z() {  $("#menu_tab_1").fadeIn(500); $("#menu_tab_1").css("display","block"); $("#menu_tab_2").css("display","none"); $("#menu_tab_3").css("display","none"); $("#menu_tab_4").css("display","none"); $("#content_menu").css("left","13px"); }
function back_x() {  $("#menu_tab_2").fadeIn(500); $("#menu_tab_1").css("display","none"); $("#menu_tab_2").css("display","block"); $("#menu_tab_3").css("display","none"); $("#menu_tab_4").css("display","none"); $("#content_menu").css("left","13px"); }
function back_c() {   $("#menu_tab_3").fadeIn(500); $("#menu_tab_1").css("display","none"); $("#menu_tab_2").css("display","none"); $("#menu_tab_3").css("display","block"); $("#menu_tab_4").css("display","none"); $("#content_menu").css("left","143px"); }
function back_v() {  $("#menu_tab_4").fadeIn(500); $("#menu_tab_1").css("display","none"); $("#menu_tab_2").css("display","none"); $("#menu_tab_3").css("display","none"); $("#menu_tab_4").css("display","block"); $("#content_menu").css("left","143px"); }