var defaultImageName = '';

function setDefaultImage(name)
{
   defaultImageName = name;
   changeImageBack(name);
}
function changeImage(name)
{
   document.images[name].src= 'buttons/' + name + 'Over.jpg';
   return true;
}
function changeImageBack(name) 
{
   if (name == defaultImageName)
      document.images[name].src= 'buttons/' + name + '.jpg';
   else
      document.images[name].src= 'buttons/' + name + 'Out.jpg';
   return true;
}
function handleMDown(name)
{
   document.images[name].src= 'buttons/' + name + 'Down.jpg';
   return true;
}
function handleMUp(name)
{
   changeImage(name);
   return true;
}