.nav	{
	padding-left:17px;
	height:50px;
	width:938px;
}
	.nav ul	{
		margin:0;
		padding:0;
	}
		.nav li	{
			display:inline;
			list-style:none;
		}
		.nav li a	{
			float:left;
			display: block;
			height: 50px;
			text-decoration:none;
		}

.nav li a.button_home {
  width: 110px;
  background: url(../images/button_home.gif) 0 0 no-repeat;
}
	.nav li a:hover.button_home {
	  background-position: -110px 0;
	}

.nav li a.button_about{
  width: 136px;
  background: url(../images/button_about.gif) 0 0 no-repeat;
}
	.nav li a:hover.button_about {
	  background-position: -136px 0;
	}
.nav li a.button_services{
  width: 139px;
  background: url(../images/button_services.gif) 0 0 no-repeat;
}
	.nav li a:hover.button_services {
	  background-position: -139px 0;
	}
.nav li a.button_gallery{
  width: 169px;
  background: url(../images/button_gallery.gif) 0 0 no-repeat;
}
	.nav li a:hover.button_gallery {
	  background-position: -169px 0;
	}
.nav li a.button_refer{
  width: 145px;
  background: url(../images/button_refer.gif) 0 0 no-repeat;
}
	.nav li a:hover.button_refer {
	  background-position: -145px 0;
	}
.nav li a.button_contact	{
  width: 154px;
  background: url(../images/button_contact.gif) 0 0 transparent no-repeat;
}
	.nav li a:hover.button_contact {
	  background-position: -154px 0;
	}

.nav li a.button_refer2{
  width: 145px;
  background: url(../images/button_refer2.gif) 0 0 no-repeat;
}
	.nav li a:hover.button_refer2 {
	  background-position: -145px 0;
	}
.nav li a.button_contact2	{
  width: 154px;
  background: url(../images/button_contact2.gif) 0 0 transparent no-repeat;
}
	.nav li a:hover.button_contact2 {
	  background-position: -154px 0;
	}