#nav_main_system li a,
#nav_main_system li a span {
    font-size:0px;
	text-decoration:none;
	cursor: pointer;
	display: block;
	height: 30px;
	width:138px;
	overflow: hidden;
	position: relative;
	text-decoration:none;
}				
 						
#nav_main_system li.bezpieczny a span {
	background-image: url(../img/system_menu.png);
	background-position:  0 0px;
	left: 0;	
	top: 0;
	width: 115px;
	text-decoration:none;
}	

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

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

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

#nav_main_system li.dlaczegolcn a span {
	background-image: url(../img/system_menu.png);
	background-position:  0 -120px;
	left: 0;	
	top: 0;
	width: 115px;
}	






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

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

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

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

#nav_main_system li.dlaczegolcn a:hover span,
#nav_main_system li.dlaczegolcn#active a span {
	background-image: url(../img/system_menu.png);
	background-position: 0px -120px;
	width: 138px;
}