[求助]table的排列

<style>
#div1 {
width: 402px !important;
width: 400px;
border-top: 1px solid #000;
border-left: 1px solid #000;
float: left;
}
#div1 ul {
width: 402px !important;
width: 400px;
margin: 0px;
padding: 0px;
}
#div1 li {
float: left;
width: 200px;
height: 50px;
list-style-type: none;
border-right:#000 1px solid;
border-bottom: #000 1px solid;
text-align: center;
line-height: 50px;
}
</style>
<div id=\"div1\">
<ul>
<li>1</li>
<li>2</li>
<li>3</li>
<li>4</li>
<li>5</li>
<li>6</li>
</ul>
</div>