table消除 td 之间的间距

.dir{
width: 400px;
height: 150px;
text-align: center;
[b]margin-top: 20px;
margin-left: 20px;
border-left: #eeeeee solid 1px;
border-top:#eeeeee solid 1px;
border-collapse:collapse;
}
.dir td{
width:25%;
border-right: #eeeeee solid 1px;
border-bottom: #eeeeee solid 1px;
}

.dir th{
width: 25%;
border-bottom: 1px solid #eeeeee;
border-right: 1px solid #eeeeee;
}