ถามเรื่องเมนู css คืออยากให้เอาเม้าส์ไปชี้แล้วรูปภาพไม่หายอ่ะครับ

/*-------------------------------------------- middle menu--------------------------------------------------------*/
#PanLeft div.stockmiddletop{
	margin:-15px 0 0 0;
	background:url(../images/stock1_02.gif) repeat-x;
	height:131px;
}
#PanLeft ul.nav{
	height:50px;
	padding:39px 0 0 5px;
	color:#000;
}
#PanLeft ul.nav li.navLink{
	display:block;
	float:left;
	height:60px;
	padding:10px 1px 0 0;
}
#PanLeft ul.nav li.navLinkNoBdr{
	display:block;
	background-image:none;
	float:left;
	height:60px;
	padding:10px 1px 0 0;
}
#PanLeft ul.nav li.navLink a.service{
	display:block;
	background:url(../images/onebit_01.png) 0 50% no-repeat;
	padding:-3px 15px 10px 58px;
	font:bold 13px/46px Arial, Helvetica, sans-serif;
	color:#171717;
	text-transform:uppercase;
	text-decoration:none;
	border-right:1px dotted #000;
}
#PanLeft ul.nav li.navLink a.service:hover{
	background:url(../images/menuhover.gif) 0 50% repeat-x;
	color:#39638A;
	
}
#PanLeft ul.nav li.navLink a.testimonial{
	display:block;
	background:url(../images/onebit_12.png) 0 50% no-repeat;
	padding:0 15px 10px 58px;
	font:bold 13px/46px Arial, Helvetica, sans-serif;
	color:#171717;
	text-transform:uppercase;
	text-decoration:none;
	border-right:1px dotted #000;
}
#PanLeft ul.nav li.navLink a.testimonial:hover{
	background:url(../images/menuhover.gif) 0 50% repeat-x;
	color:#39638A;
}
#PanLeft ul.nav li.navLink a.project{
	display:block;
	background:url(../images/onebit_13.png) 5px 50% no-repeat;
	padding:0 15px 10px 58px;
	font:bold 13px/46px Arial, Helvetica, sans-serif;
	color:#171717;
	text-transform:uppercase;
	text-decoration:none;
	border-right:1px dotted #000;
}
#PanLeft ul.nav li.navLink a.project:hover{
	background:url(../images/menuhover.gif) 0 50% repeat-x;
	color:#39638A;
}
#PanLeft ul.nav li.navLink a.privacy{
	display:block;
	background:url(../images/onebit_14.png) 0 50% no-repeat;
	padding:0 15px 10px 58px;
	font:bold 13px/46px Arial, Helvetica, sans-serif;
	color:#171717;
	text-transform:uppercase;
	text-decoration:none;
	border-right:1px dotted #000;
}
#PanLeft ul.nav li.navLink a.privacy:hover{
	background:url(../images/menuhover.gif) 0 50% repeat-x;
	color:#39638A;
}
#PanLeft ul.nav li.navLinkNoBdr a.moreLink{
	display:block;
	background:url(../images/onebit_39.png) 0 50% no-repeat;
	padding:0 15px 10px 58px;
	font:bold 13px/46px Arial, Helvetica, sans-serif;
	color:#171717;
	text-transform:uppercase;
	text-decoration:none;
	border-right:1px dotted #000;
}
#PanLeft ul.nav li.navLinkNoBdr a.moreLink:hover{
	background:url(../images/menuhover.gif) 0 50% repeat-x;
	color:#39638A;
}
/*-------------------------------------------- end middle menu--------------------------------------------------------*/