picture field fullsize inside cell

hi,

I want to use an image field. upload and view-page work already, but

in the add and the edit page I want to place the image (uploaded picture) in one seperate cell. currently the generated html-code of the image field inside a cell always contains a table with
5 columns:

<td class="preview"> ... </td> // here the picture is referenced
<td class="name"> ... </td> // contains the filename
<td class="size"> ... </td> // shows the file size
<td></td>
<td> class="delete> ... </td> // contains the DELETE button

how I can move the "preview" in an own cell where I can fit the picture fullsize? now it is very small because the text of filename takes much of the space right to the picture.

OR

how I can change the appearance of this table, that it will not arrange the elements horizontal but vertical?

thank you
Helmut