调试易

#head{
margin:0 auto;
margin:0;
width:998px;
height:100px;
background-image:url(../2008.jpg);
z-index:2100;
border-top:none;
}#logo{
background-image:url(../logo/logo.gif);
    float:left;
position:relative;
top:7px;
left:7px;
width: 180px;
height:77px;
z-index:3000;
}
#daohang{
position: relative;
top:11px;
left:590px;
width:220px;
height:12px;
font-weight:normal;
}#daohang li{
font-weight:normal;
float:left;
}
#daohang li a{
font-weight:normal;
font-size:12px;
text-decoration: underline;
padding-top:2px;
display:block;
width:50px;
height:12px;
text-align:center;
margin-left:2px;
color:#FFF;
}#daohang li a:hover{
color:#ff0000;}#daohang ul{
margin:0px; padding:0px; list-style-type:none;}#nav{
font-family:'lucida grande',tahoma,helvetica,arial,'bitstream vera sans',sans-serif;
text-align:center;
font-size:14px;
line-height:19px;
font-weight:bold;
    position: relative;
    top:45px;
left:30px;
height:29px;
width: 400px;
vertical-align:middle;
z-index:4000;
}
#nav li{
float:left;
}
#nav li a{
text-decoration:none;
padding-top:2px;
display:block;
width:75px;
height:20px;
text-align:center;
margin-left:2px;
color:#FFFFFF;
}#nav li a:hover{
color:#ff0000;
}这就是head部分的代码 ，分logo、daohang（小导航条）、nav(大导航条)。 怎么在ie 与ff下不一样？？ 谁帮忙改改