function initbg()
{
  if ($$('.blocAgenda div').size() > 0)
  {
    $$('.blocAgenda div').each
	  (
	    function(elt)
	    {
	      hover(elt);
	    }
	  );
	}
	
	if ($$('.blocAffiche div').size() > 0)
	{
	  $$('.blocAffiche div').each
  	(
  	  function(elt)
  	  {
  	    hover(elt);
  	  }
  	);
	}
	if ($$('.blocSmall div').size() > 0)
	{
	  $$('.blocSmall div').each
  	(
  	  function(elt)
  	  {
  	    hover(elt);
  	  }
  	);
	}
	if ($$('.blocBig div').size() > 0)
	{
	  $$('.blocBig div').each
  	(
  	  function(elt)
  	  {
  	    hover(elt);
  	  }
  	);
  }
	
}

function hover(elt)
{
  if (elt.className == '')
	{
	  elt.observe('mouseover', function()
    {
      elt.setStyle({backgroundColor: '#ececec'});
    });
	  elt.observe('mouseout', function()
    {
      elt.setStyle({backgroundColor: 'transparent'});
    });
	}
}

Event.observe(window, 'load', initbg);