window.addEvent('domready', function(){

/*gestion affichage spécifik aux navigateurs*/
if (Browser.Engine.gecko){

$('logoIBM').setStyle('margin-top', '12px');
	
}


$('nav1').addEvents({
    'mouseover': function(){
        //alert('mouse over');
		$('menu').setStyle('background-position', '0px -80px ');
    },
	'mouseout': function(){
        //alert('mouse over');
		$('menu').setStyle('background-position', '0px 0px ');
		
    }
});

$('nav2').addEvents({
    'mouseover': function(){
        //alert('mouse over');
		$('menu').setStyle('background-position', '0px -160px ');
    },
	'mouseout': function(){
        //alert('mouse over');
		$('menu').setStyle('background-position', '0px 0px ');
    }
});

$('nav3').addEvents({
    'mouseover': function(){
        //alert('mouse over');
		$('menu').setStyle('background-position', '0px -240px ');
    },
	'mouseout': function(){
        //alert('mouse over');
		$('menu').setStyle('background-position', '0px 0px ');
    }
});

$('nav4').addEvents({
    'mouseover': function(){
        //alert('mouse over');
		$('menu').setStyle('background-position', '0px -320px ');
    },
	'mouseout': function(){
        //alert('mouse over');
		$('menu').setStyle('background-position', '0px 0px ');
    }
});

$('nav5').addEvents({
    'mouseover': function(){
        //alert('mouse over');
		$('menu').setStyle('background-position', '0px -400px ');
    },
	'mouseout': function(){
        //alert('mouse over');
		$('menu').setStyle('background-position', '0px 0px ');
    }
	

});





	

});