.nav ul li a.menu_home{background: url(home.png) center no-repeat;}
	.nav ul li a.menu_user{background: url(user.png) center no-repeat;}
	.nav ul li a.menu_double_user{background: url(double_user.png) center no-repeat;}
	.nav ul li a.menu_application{background: url(application.png) center no-repeat;}
	.nav ul li a.menu_mail{background: url(mail.png) center no-repeat;}
	.nav ul li a.menu_computer{background: url(computer.png) center no-repeat;}
	.nav ul li a.menu_vcard{background: url(vcard.png) center no-repeat;}
	.nav ul li a.menu_presentation{background: url(presentation.png) center no-repeat;}
	.nav ul li a.menu_calendar{background: url(calendar.png) center no-repeat;}
	.nav ul li a.menu_tag{background: url(tag.png) center no-repeat;}
	.nav ul li a.menu_off{background: url(off.png) center no-repeat;}
	.nav ul li a.menu_pencil{background: url(pencil.png) center no-repeat;}
	.nav ul li a.menu_folder{background: url(folder.png) center no-repeat;}
	.nav ul li a.menu_star{background: url(star.png) center no-repeat;}
	.nav ul li a.menu_pdf{background: url(pdf.png) center no-repeat;}
	.nav ul li a.menu_plus{background: url(plus.png) center no-repeat;}
	.nav ul li a.menu_favorite{background: url(favorite.png) center no-repeat;}