#nav_main_system li a,
#nav_main_system li a span {
    font-size:0px;
	text-decoration:none;
	cursor: pointer;
	display: block;
	height: 30px;
	
	overflow: hidden;
	position: relative;
}				
 						
#nav_main_system li.polska a span {
	background-image: url(../img/referencje_menu.png);
	background-position:  0 0px;
	left: 0;	
	top: 0;
	width: 115px;
}	

#nav_main_system li.jedno a span {
	background-image: url(../img/referencje_menu.png);
	background-position:  0 -30px;
	left: 0;	
	top: 0;
	width: 115px;
	
}

#nav_main_system li.mieszkaniowe a span {
	background-image: url(../img/referencje_menu.png);
	background-position:  0 -60px;
	left: 0;	
	top: 0;
	width: 115px;
}	

#nav_main_system li.uzytkowe a span {
	background-image: url(../img/referencje_menu.png);
	background-position:  0 -90px;
	left: 0;	
	top: 0;
	width: 115px;
}		

#nav_main_system li.sportowe a span {
	background-image: url(../img/referencje_menu.png);
	background-position:  0 -117px;
	left: 0;	
	top: 0;
	width: 115px;
	font-size:0px;
	text-decoration:none;
}	

#nav_main_system li.rozne a span {
	background-image: url(../img/referencje_menu.png);
	background-position:  0 -145px;
	left: 0;	
	top: 0;
	width: 115px;
}	




#nav_main_system li.polska a:hover span,
#nav_main_system li.polska#active a span {
	background-image: url(../img/referencje_menu.png);
	background-position:  0 0px;
	width: 138px;
}							

#nav_main_system li.jedno a:hover span,
#nav_main_system li.jedno#active a span {
	background-image: url(../img/referencje_menu.png);
	background-position: 0px -30px;
	width: 138px;
	
}	

#nav_main_system li.mieszkaniowe a:hover span,
#nav_main_system li.mieszkaniowe#active a span {
	background-image: url(../img/referencje_menu.png);
	background-position: 0px -60px;
	width: 138px;
}	

#nav_main_system li.uzytkowe a:hover span,
#nav_main_system li.uzytkowe#active a span {
	background-image: url(../img/referencje_menu.png);
	background-position: 0px -90px;
	width: 138px;
}	

#nav_main_system li.sportowe a:hover span,
#nav_main_system li.sportowe#active a span {
	background-image: url(../img/referencje_menu.png);
	background-position: 0px -117px;
	width: 138px;
	text-decoration:none;
	
}		

#nav_main_system li.rozne a:hover span,
#nav_main_system li.rozne#active a span {
	background-image: url(../img/referencje_menu.png);
	background-position: 0px -145px;
	width: 138px;
}