Problem with tables in Twenty Eleven

Hi,

I have problems with Twenty Eleven. I created a child theme, and I want to use a table with absolutely no spaces between the row. There will be 2 cells on each row, one with an image and one with text.

Here is the HTML code :

<table>
<tbody>
<tr>
<td class="listhomepage1" style="border: 1px solid #000000;"><img title="50x50" src="THEURL/50x50.png" width="50" height="50" /></td>
<td class="listhomepage2" style="border: none;">blabla</td>
</tr>
</tbody>
</table>

and the CSS

.listhomepage1 {

        margin:0 0 0 0;
        padding:0px 0px 0px 0px;

}

.listhomepage2 {

        margin:0 0 0 0;
	padding:0px 0px 0px 0px;

}

So, there should be my image directly rounded by the black border, with no space between.

But here is how my images appears : Link to the image. There is a 2px-wide blank on the right and a 6px-wide blank at the bottom. Moreover, the image is no more 50×50 but 46×50.

Have you got any idea where it could come from ?
Thanks in advance