DIV布局，并列同行显示

有三个DIV 想让其并列显示，在DW设计中能并列显示，但当到ISS或者IE里却是分行显示的。初学ASP，还请各位高手们，看看错在那里，应该怎样去做修改，以下是我的代码

<div>
<div>
<div>
<div >
<table width="213" height="219" border="0" cellpadding="1">
<tr>
<th height="215" scope="col">&nbsp;</th>
</tr>
</table>
</div>
<div >
<table width="555" height="220" border="0" cellpadding="1">
<tr>
<th width="95" height="87" scope="col">&nbsp;</th>
<th width="364" scope="col">&nbsp;</th>
</tr>
<tr>
<th height="15" colspan="2" scope="row"><hr /></th>
</tr>
<tr>
<th height="110" scope="row">&nbsp;</th>
<td>&nbsp;</td>
</tr>
</table>
</div>
<div >
<table width="220" border="0" cellpadding="1">
<tr>
<td width="220" height="217">&nbsp;</td>
</tr>
</table>
</div>
</div>
</div>
</div>

<div>
<div>
<div >
<div >
<table width="213" height="219" border="0" cellpadding="1">
<tr>
<th height="215" scope="col">&nbsp;</th>
</tr>
</table>
</div>
<div >
<table width="555" height="220" border="0" cellpadding="1">
<tr>
<th width="95" height="87" scope="col">&nbsp;</th>
<th width="364" scope="col">&nbsp;</th>
</tr>
<tr>
<th height="15" colspan="2" scope="row"><hr /></th>
</tr>
<tr>
<th height="110" scope="row">&nbsp;</th>
<td>&nbsp;</td>
</tr>
</table>
</div>
<div >
<table width="220" border="0" cellpadding="1">
<tr>
<td width="220" height="217">&nbsp;</td>
</tr>
</table>
</div>
</div>
</div>
</div>

宽度，，高度，，为什么不带单位，，，？

看是否 总的宽度 ，，小了，，

横排，，用 <span>做，，