var preloaded = [];
// here is a lame preloading script i am putting in just for demonstration
for (var i = 1; i <= 7; i++)
  {
  preloaded[i] = [loadImage(i + "-0.gif"), loadImage(i + "-1.gif")];
  }

function init()
  {
  // whatever stuff you need to do onload goes here.

  //==========================================================================================
  // if supported, initialize optimalDropDowns
  //==========================================================================================
  // Check isSupported() so that menus aren't accidentally sent to non-supporting browsers.
  // This is better than server-side checking because it will also catch browsers which would
  // normally support the menus but have javascript disabled.
  //
  // If supported, call initialize() and then hook whatever image rollover code you need to do
  // to the .onactivate and .ondeactivate events for each menu.
  //==========================================================================================
  if(optimalDropDown.isSupported())
    {
    optimalDropDown.initialize();

    // hook all the image swapping of the main toolbar to menu activation/deactivation
    // instead of simple rollover to get the effect where the button stays hightlit until
    // the menu is closed.

    //menu1.onactivate = function() { swapImage("button1", preloaded[1][1].src) };
    //menu1.ondeactivate = function() { swapImage("button1", preloaded[1][0].src) };

    menu2.onactivate = function() { swapImage("button2", preloaded[2][1].src) };
    if(section == "ofirmie")
      {
      menu2.ondeactivate = function() { swapImage("button2", preloaded[2][1].src) };
      }
    else
      {
      menu2.ondeactivate = function() { swapImage("button2", preloaded[2][0].src) };
      }

    menu3.onactivate = function() { swapImage("button3", preloaded[3][1].src) };
    if(section == "budowlane")
      {
      menu3.ondeactivate = function() { swapImage("button3", preloaded[3][1].src) };
      }
    else
      {
      menu3.ondeactivate = function() { swapImage("button3", preloaded[3][0].src) };
      }

    menu4.onactivate = function() { swapImage("button4", preloaded[4][1].src) };
    if(section == "kowalstwo")
      {
      menu4.ondeactivate = function() { swapImage("button4", preloaded[4][1].src) };
      }
    else
      {
      menu4.ondeactivate = function() { swapImage("button4", preloaded[4][0].src) };
      }

    menu5.onactivate = function() { swapImage("button5", preloaded[5][1].src) };
    if(section == "realizacje")
      {
      menu5.ondeactivate = function() { swapImage("button5", preloaded[5][1].src) };
      }
    else
      {
      menu5.ondeactivate = function() { swapImage("button5", preloaded[5][0].src) };
      }

    menu6.onactivate = function() { swapImage("button6", preloaded[6][1].src) };
    if(section == "praca")
      {
      menu6.ondeactivate = function() { swapImage("button6", preloaded[6][1].src) };
      }
    else
      {
      menu6.ondeactivate = function() { swapImage("button6", preloaded[6][0].src) };
      }

    menu7.onactivate = function() { swapImage("button7", preloaded[7][1].src) };
    if(section == "kontakt")
      {
      menu7.ondeactivate = function() { swapImage("button7", preloaded[7][1].src) };
      }
    else
      {
      menu7.ondeactivate = function() { swapImage("button7", preloaded[7][0].src) };
      }
    }
  }


function loadImage(sFilename)
  {
  var img = new Image();
  img.src = urlRoot + "/images/" + sFilename;
  return img;
  }


function swapImage(imgName, sFilename)
  {
  document.images[imgName].src = sFilename;
  }