Put Table In Page To Put All The Things In An Order

i have put a table in my page to put all the things in an order the goal is to have inside a big table two sub tables in two columns but the second sub table goes a lower than it has to be here is the code without details

<table id="protolayer" style="position: absolute; left: 120px; top: 72px; background-color: white;">
<tr>
<td colspan=2>
<table>
<tr>
<td>
<asp:DataGrid ID="GridView1"></>
</td>
</tr>
<tr>
<td>
<object width="530" height="350" id="Object2">
</object>
</td>
<td>
</td>
</tr>
</table>
</td>
<td style="position:relative">.........................................