HTML help-why is the textcontent in my table showing up in the middle

HTML help-why is the text/content in my table showing up in the middle?

So I've been working on building a website based on a giant table that I could build my background on.... but for whatever reason, in my 'content boxes' that I want to use for text/etc. its showing up in the middle (not centered) of each cell! What is up with that? BTW I'm using dreamweaver, so is it doing something funky without me knowing? If its not, what is the code to fix this??? I want to be able to write/code/etc. from the top left of each cell!

Help!

Thank-you

<table width="1246" border="0" cellpadding="0" cellspacing="0">
<tr>
<td colspan="4" height="300">
<img src="img" />
</td>
</tr>
<tr>
<td rowspan="2" width="308" height="664" align="left">
<img src="img" />
</td>
<td width="321" height="248" align="left">
<img src="img" />
</td>
<td width="340">video box</td>
<td rowspan="2" width="277" height="664" align="right"><img src="img" /></td>
</tr>
<tr>
<td colspan="2">
main content box
</td>
</tr>
</table>

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