<table cellspacing="0" cellpadding="0">
<textarea rows="5" cols="60" name="question"></textarea>
<tr>
<td><input type="text" readonly="1" value="127.0.0.1" /></td>
<td><input type="submit" value="Skicka" /></td>
</tr>
</table>
equals to
How can I do so that the submit button stays where I want it (look pic). If I mess with width of the table it gets completely different in Firefox and IE.

Create your table like this:
Note the colspan=”2″ and the align=”right” attributes on the first and last td element.
Also I moved the textarea into a td as well.