function changeMenu(id, status, last)
{
    var menu = document.getElementById(id);
    
    if(status == 'active')
    {
      if(last == true)
      {
        menu.className = 'hover last';
      }
      else
      {
        menu.className = 'hover';
      }
    }
    else if(status == 'active href')
    {
      if(last == true)
      {
        menu.className = 'hover last';
      }
      else
      {
        menu.className = 'hover';
      }
    }
    else if(status == 'unactive href')
    {
      if(last == true)
      {
        menu.className = 'hover last';
      }
      else
      {
        menu.className = 'hover';
      }
    }
    else
    {
      if(last == true)
      {
        menu.className = 'last';
      }
      else
      {
        menu.className = '';
      }
    }
    
    if(id == 'menu_bowling' && (status == 'active' || status == 'active href'))
    {
      document.getElementById('submenu').className = '';
    }
    else if(id == 'menu_bowling' && ( status != 'active' || status == 'active href'))
    {
      document.getElementById('submenu').className = 'hidden';
    }

    if(id == 'menu_firemni_akce' && (status == 'active' || status == 'active href'))
    {
      document.getElementById('submenu_firemni_akce').className = '';
    }
    else if(id == 'menu_firemni_akce' && ( status != 'active' || status == 'active href'))
    {
      document.getElementById('submenu_firemni_akce').className = 'hidden';
    }
}

function switchChangebox(id){

    var obj1 = document.getElementById('akce1');
    var obj2 = document.getElementById('akce2');
    var obj3 = document.getElementById('akce3');
    var obj4 = document.getElementById('akce4');

    if(!id){

        if(obj1)  document.getElementById('akce1').className = 'poradnik';
        if(obj2)  document.getElementById('akce2').className = 'hidden';
        if(obj3)  document.getElementById('akce3').className = 'hidden';
        if(obj4)  document.getElementById('akce4').className = 'hidden';
    }

    if(id == "1"){

        if(obj1)  document.getElementById('akce1').className = 'poradnik';
        if(obj2)  document.getElementById('akce2').className = 'hidden';
        if(obj3)  document.getElementById('akce3').className = 'hidden';
        if(obj4)  document.getElementById('akce4').className = 'hidden';
    }
    if(id == "2"){

        if(obj1)  document.getElementById('akce1').className = 'hidden';
        if(obj2)  document.getElementById('akce2').className = 'poradnik';
        if(obj3)  document.getElementById('akce3').className = 'hidden';
        if(obj4)  document.getElementById('akce4').className = 'hidden';
    }
    if(id == "3"){

        if(obj1)  document.getElementById('akce1').className = 'hidden';
        if(obj2)  document.getElementById('akce2').className = 'hidden';
        if(obj3)  document.getElementById('akce3').className = 'poradnik';
        if(obj4)  document.getElementById('akce4').className = 'hidden';
    }
    if(id == "4"){

        if(obj1)  document.getElementById('akce1').className = 'hidden';
        if(obj2)  document.getElementById('akce2').className = 'hidden';
        if(obj3)  document.getElementById('akce3').className = 'hidden';
        if(obj4)  document.getElementById('akce4').className = 'poradnik';
    }

    return false;

}
function autoswitchChangebox(arg, stop){

        var b2;

        var obj1 = document.getElementById('akce1');
        var obj2 = document.getElementById('akce2');
        var obj3 = document.getElementById('akce3');
        var obj4 = document.getElementById('akce4');

        if(obj1)    var max = 1;
        if(obj2)    var max = 2;
        if(obj3)    var max = 3;
        if(obj4)    var max = 4;

        if(arg)
        {
            if(isInteger(arg) == true) var b = arg;
             else var b = 2;
        }

        if(arg > max){
            var b = 1;
        }

        if(!arg)
        {
            var b = 2;
        }

        if(stop){
            timer = clearTimeout(timer);
        }
        b2 = b+1;

        if(obj2 || obj3 || obj4)
        {
            timer = setTimeout('switchChangebox(' + b + '); autoswitchChangebox(' + b2 + ');', 10000);
        }
}

function isUnsignedInteger(s) {
    return (s.toString().search(/^[0-9]+$/) == 0);
}

function isInteger(s) {
    return (s.toString().search(/^-?[0-9]+$/) == 0);
}