var menuObj = '';

 function showMenu(menuID)
 {
  if(menuObj)
  { menuObj.style.display = 'none'; }
  if(menuID)
  { menuObj = document.getElementById(menuID);
    menuObj.style.display = ''; }
 }

 var tabX = 1;

 function showTab(x)
 {
  //hide old tab
  var tabObj = "tab_tab_" + tabX;
  var tabContentObj = "tab_content_" + tabX;
  document.getElementById(tabObj).className = "tabs_TabB";
  document.getElementById(tabContentObj).className = "tabs_ContentB";

  //show new tab
  tabX = x;
  tabObj = "tab_tab_" + tabX;
  tabContentObj = "tab_content_" + tabX;
  document.getElementById(tabObj).className = "tabs_TabF";
  document.getElementById(tabContentObj).className = "tabs_ContentF";
 }