tables

To speed loading in netscape I am breaking my page into a series of tables 
using an image at top and bottom for rounded corners.
<table>
	<tr>
		<td>
			<img src = "top.gif" width = "780" height = "180" >this is the logo image
		</td>
	</tr>
</table>

<table>
	<tr>
		<td align = "center">
			<img src = "topbar.gif" width = "780" height = "43"> top corners
		</td>
	</tr>
	<tr bgcolor = "#f7efde">
		<td>
body text

the problem is that between /tr and tr the background shows through, I used 
margin-top:-80px to overlap images to verify that the problem is not with 
the image. How can I make the image blend with the rest of the table? Tried 
border=0 cellspacing=0 cellpadding=0 marginheight=0 nothing makes any 
differance in IE. Saw this done somewhere but darned if I can remember how 
they did it. Also table width = 780 and image width = 780 yet the image 
comes out with a thin border which I can see with bgcolor=red.

TIA

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