var buttons;

function preloadImages()
{
  button_items = ['learn_more'];

  buttons = new Array();
  for (i = 0; i < button_items.length; i++)
  {
     button_item = button_items[i];
     buttons[i] = new Array(2);
     buttons[i][0] = new Image();
     buttons[i][0].src = 'images/buttons/' + button_item + '.png';
     buttons[i][1] = new Image();
     buttons[i][1].src = 'images/buttons/' + button_item + '_hover.png';
  }
  return true;
}

function hoverButton(img, index, state)
{
  if (buttons)
  {
    img.src = buttons[index][state].src;
  }
  return true;
}

$(document).ready(function()
{
  preloadImages();
});