Problem with Input Fields b/w FF and IE

[russap5]

I am trying to make two stacked input fields show up the same width in both FF and IE. This is for a dummy site, very basic. It is to look like a username and password entry, but does not need to be active. I am using Expression Web and it looks perfect there, and in FF it looks about the same, but in IE the top username field is all funky. There is also a submit button to the bottom right of the password field.

I know this is basic and stone-age coding but im not a pro.
here is some code for the row in the table:

<tr>

<td style="text-align:right; width: 600px; vertical-align:bottom;">
<p class="username">Username: </p>
<p class="password">Password: </p>
</td>

<td style="text-align:center; width: 100px; height: 55px; vertical-align:bottom;">
<input name="Username" type="text" tabindex="1" size="20" style="margin-bottom:2px;" />

<input name="Password" type="password" tabindex="2" size="20" style="margin-bottom:17px;"/></td>

<td style="text-align:right; height: 55px; vertical-align:bottom;">
<input name="Submit" type="submit" value="Submit" tabindex="3" style="height: 23px; margin-left:5px; margin-bottom:17px;"/></td>

</tr>


Thanks for the help!