Changing field entry width in IE

Hi! Thanks for reading.

I’d like to change the widt of the text entry field in a sidebar. It looks fine in Firefox, but in IE it currently is wider that the sidebar and sticks out on the right side :s

I use wp-responder generated code for a newsletter signup. This plugin generates html code that I copy/paste into a plain text widget.

This is a part of the code I used:

<td><span class=”wprsftf wpr-subform-textfield-name”>
<input type=”text” name=”name” size=”15″/></td>

to make the text field of 15 width. As said this works in Firefox, but not in IE.

How to make IE display the text field with 15 or similar width?

Thanks!