wrapper falls short

below is part of the css code that I am using for the following website. The problem is that in IE 6 the header and footer appear to fall short of the right edge by about 10 pixels. Viewed in Netscape there is no problem. the site is

http://www.fauna-iberica.mncn.csic.es/fauna_new/index.php

The body and wrapper code are:

/* General rules */
img
{
display: block;
border: 0;
}

/* Establish general layout parameters */
body
{
background: #091A37;
color: #000;
margin: 0;
padding: 0;
border: 0;
text-align: center;
font-family: arial, verdana, lucida, helvetica, sans-serif;
padding-bottom: 25px;
}

#wrapper
{
color: #000;
margin: 10px auto;
padding: 0;
width: 750px;
/* bmh */
voice-family: "\"}\"";
voice-family: inherit;
width: 748px;
background: #fff;
}

html>#wrapper { width: 748px; }

any help would be greatly appreciated[/url]