#main_nav {
	display:			block;
	width:				213px;
	height:				90px;
	background-image:		url(../images/menu_tower.jpg);
	background-repeat:		no-repeat;
	background-position:		top center;
	position:			relative;
	padding:			0;
	margin-top:			0;
	margin-bottom:			0;
}

#main_nav dd {
	position:			absolute;
	padding:			0;
	margin:				0;
}

#main_nav #pic_home {
	left:				0px;	
	top:				0px;
	z-index:			20;
}

#pic_home a:hover {
    	background: 	transparent url(../images/menu_tower.jpg) 0 -90px no-repeat;
	z-index:	5;
}

#main_nav #pic_company {
	left:				0px;
	top:				15px;
	z-index:			20;
}

#pic_company a:hover {
    	background: 	transparent url(../images/menu_tower.jpg) 0 -105px no-repeat;
	z-index:	5;
}

#main_nav #pic_portfolio {
	left:				0px;
	top:				30px;
	z-index:			20;
}

#pic_portfolio a:hover {
    	background: 	transparent url(../images/menu_tower.jpg) 0 -120px no-repeat;
	z-index:	5;
}

#main_nav #pic_testimonials {
	left:				0px;
	top:				45px;
	z-index:			20;
}

#pic_testimonials a:hover {
    	background: 	transparent url(../images/menu_tower.jpg) 0 -135px no-repeat;
	z-index:	5;
}

#main_nav #pic_services {
	left:				0px;
	top:				60px;
	z-index:			20;
}

#pic_services a:hover {
    	background: 	transparent url(../images/menu_tower.jpg) 0 -150px no-repeat;
	z-index:	5;
}

#main_nav #pic_contact {
	left:				0px;
	top:				75px;
	z-index:			20;
}

#pic_contact a:hover {
    	background: 	transparent url(../images/menu_tower.jpg) 0 -165px no-repeat;
	z-index:	5;
}

#main_nav a {
	display:			block;
	width:				213px;
	height:				15px;
	background:			transparent;
	text-decoration:		none;
	z-index:			20;
}

/* style the span text so that it is not displayed */
#main_nav a span, #main_nav a:visited span {
  	display:		none;
}