ul#nav { background:url(graphics/navigation.gif); position:relative; margin:0; }
ul#nav li { float:left; list-style-type:none; }
ul#nav li a { height:33px; display:block; position:absolute; top:0; outline:none; }

ul#nav span {
display:none;
}

li#bthome a, li#btused a, li#btabout a, li#btcar_source a, li#btcontact a {background:url(graphics/navigation.gif) }

li#bthome a 									{ background-position:0 0; width:132px; left:0 }
li#bthome a:hover, li#bthome a.current			{ background-position:0 -33px }


li#btused a 									{ background-position:-132px 0; width:132px; left:132px }
li#btused a:hover, li#btused a.current			{ background-position:-132px -33px }


li#btabout a 									{ background-position:-264px 0; width:132px; left:264px }
li#btabout a:hover, li#btabout a.current		{ background-position:-264px -33px }


li#btcar_source a 									{ background-position:-396px 0; width:132px; left:396px }
li#btcar_source a:hover, li#btcar_source a.current	{ background-position:-396px -33px }


li#btcontact a 									{ background-position:-529px 0; width:133px; left:529px }
li#btcontact a:hover, li#btcontact a.current	{ background-position:-529px -33px }