window.addEvent('domready', function ()
{	
	if ($('boite1'))
	{
		$('gauche').addEvent('mouseover', function(e)
		{
			$('boite1_hide').setStyle('visibility', '') ;			
		})
		
		$('droit').addEvent('mouseover', function(e)
		{
			$('boite2_hide').setStyle('visibility', '') ;			
		})
		
		$('gauche').addEvent('mouseout', function(e)
		{
			$('boite1_hide').setStyle('visibility', 'hidden') ;			
		})
		
		$('droit').addEvent('mouseout', function(e)
		{
			$('boite2_hide').setStyle('visibility', 'hidden') ;			
		})
	}
}) ;