I'm using Dynamic Drive's Ajax Tabs on my business directory homepage. The width of the tabbed content is exactly how I want it in Firefox, but it is several pixels narrower in IE. Can someone help me straighten it out, so that it is the same in both browsers?

My site: www.FindSoKy.com

CSS:
Code CSS:
/************ CATEGORY TABS ********************/
.cat_tabs{
padding: 3px 0;
margin-left: 0;
margin-top: 1px;
margin-bottom: 0;
font: bold 12px Arial;
list-style-type: none;
text-align: left; /*set to left, center, or right to align the menu as desired*/
}
 
.cat_tabs li{
display: inline;
margin: 0;
}
 
.cat_tabs li a{
text-decoration: underline;
padding: 3px 11px;
margin-right: -5px;
border-bottom : 1px solid #778;
border-left : 1px solid #B8CF81;
border-right : 1px solid #B8CF81;
border-top : 1px solid #778;
color: #fff;
background: white url(/template/FindSoKy/ajaxtabs/ajaxtabs/shade23.gif) top left repeat-x;
}
 
.cat_tabs li a:visited{
color: #fff;
}
 
.cat_tabs li a:hover{
text-decoration: none;
color: #fff;
}
 
.cat_tabs li.selected{
position: relative;
top: 0px;
}
 
.cat_tabs li.selected a{ /*selected main tab style */
background-image: url(/template/FindSoKy/ajaxtabs/ajaxtabs/shadeactive23.gif);
 
}
 
.cat_tabs li.selected a:hover{ /*selected main tab style */
text-decoration: none;
}
 
.cat_tabs_style{
border: 1px solid #DADADA;
width: 670px;
height: 250px;
margin-bottom: 1em; padding: 10px;
}
 
.cat_tabs_links li {
list-style: none;
margin-left: 10px;
}
 
.cat_tabs_links a:link {
    COLOR: #004400;
    font-size : 12px; 
    font-family: Arial, Sans-Serif;
    text-decoration: underline;
}
 
.cat_tabs_links a:visited {
    COLOR: #004400;
    font-size : 12px; 
    font-family: Arial, Sans-Serif;
    text-decoration: underline;
}
 
.cat_tabs_links a:hover {
    COLOR: #004400;
    font-size : 12px; 
    font-family: Arial, Sans-Serif;
    text-decoration: none;
}
 
.cat_tabs_links a:active {
    COLOR: #004400;
    font-size : 12px; 
    font-family: Arial, Sans-Serif;
    text-decoration: none;
}
 
span.text_large_green {
    font-family: Arial, Sans-Serif;
    font-size: 18px;
    text-decoration : none; 
    color: #004400;
}
 
span.text_tabs {
    color: #004400;
    font-size: 15px;
	font-weight: bold;
	text-decoration: none;
    font-family: Arial, Sans-Serif;
}

html:
HTML Code:
<ul id="maintab" class="cat_tabs">
	<li class="selected"><a href="#default" rel="ajaxcontentarea" rev="/template/FindSoKy/css.css">Top Categories</a></li>
	<li><a href="/template/FindSoKy/ajaxtabs/external.htm" rel="ajaxcontentarea" rev="/template/FindSoKy/css.css">Auto Repair</a></li>
	<li><a href="/template/FindSoKy/ajaxtabs/external2.htm" rel="ajaxcontentarea" rev="/template/FindSoKy/css.css">Child Care</a></li>
	<li><a href="/template/FindSoKy/ajaxtabs/external3.htm" rel="ajaxcontentarea" rev="/template/FindSoKy/css.css">Health Care</a></li>
	<li><a href="/template/FindSoKy/ajaxtabs/external4.htm" rel="ajaxcontentarea" rev="/template/FindSoKy/css.css">Personal Services</a></li>
	<li><a href="/template/FindSoKy/ajaxtabs/external5.htm" rel="ajaxcontentarea" rev="/template/FindSoKy/css.css">Home Services</a></li>
	<li><a href="/template/FindSoKy/ajaxtabs/external6.htm" rel="ajaxcontentarea" rev="/template/FindSoKy/css.css">Restaurants</a></li>
</ul>

<div id="ajaxcontentarea" class="cat_tabs_style">
	<table cellpadding="0" cellspacing="0" border="0" width="100&#37;" height="204">
		<tr>
			<td colspan="2" valign="top" style="padding-top:5px;padding-left:5px">
			<span class="text_large_green">3,300+ Bowling Green Businesses and Service Professionals!</span>
			</td>
		</tr>
		<tr>
			<td colspan="2" valign="top" style="padding-top:5px">
				<table width="100%" border="0" cellpadding="0" cellspacing="8">
					<tr>
						<td valign="top" width="33%">
							<a href="/Category/Automotive/"><span style="font-weight:bold">Automotive</span></a>
							<br />
							<a href="/Category/Automotive/Auto-Dealers/">Dealers</a>, <a href="/Category/Automotive/Auto-Repair-Service/">Repair</a>, <a href="/Category/Automotive/Auto-Washing-Detailing/">Detailing</a>...
						</td>
						<td valign="top" width="33%">
							<a href="/Category/Food-Entertainment/"><span style="font-weight:bold">Entertainment</span></a>
							<br />
							<a href="/Category/Food-Entertainment/Restaurants/">Restaurants</a>, <a href="/Category/Food-Entertainment/Event-Planning/">Event Planning</a>...
						</td>
						<td valign="top" width="33%">
							<a href="/Category/Personal-Services/"><span style="font-weight:bold">Personal Services </span></a>
							<br />
							<a href="/Category/Personal-Services/Florists/">Florists</a>, <a href="/Category/Personal-Services/Beauty-Salons-Hair-Care/">Hair Salons</a>, <a href="/Category/Personal-Services/Nail-Tanning-Salons/">Nail Salons</a>...
						</td>
					</tr>
					<tr>
						<td valign="top" width="33%">
							<a href="/Category/Business-Services/"><span style="font-weight:bold">Business & Computer Services</span></a>
							<br />
							<a href="/Category/Business-Services/Computer-Services/">Computer Service</a>, <a href="/Category/Business-Services/Business-Consulting/">Consulting</a>...
						</td>
						<td valign="top" width="33%">
							<a href="/Category/Health/"><span style="font-weight:bold">Health</span></a>
							<br />
							<a href="/Category/Health/Dentists-Dental-Services/">Dentists</a>, <a href="/Category/Health/Physicians/">Doctors</a>, <a href="/Category/Health/Chiropractors/">Chiros</a>, <a href="/Category/Health/Eye-Care/">Eye Care</a>...
						</td>
						<td valign="top" width="33%">
							<a href="/Category/Pets/"><span style="font-weight:bold">Pets</span></a>
							<br />
							<a href="/Category/Pets/Veterinarians/">Veterinarians</a>, <a href="/Category/Pets/Kennels-Pet-Boarding/">Kennels</a>, <a href="/Category/Pets/Pet-Grooming/">Grooming</a>...
						</td>
					</tr>
					<tr>
						<td valign="top" width="33%">
							<a href="/Category/Education/"><span style="font-weight:bold">Education</span></a>
							<br />
							<a href="/Category/Education/Dance-Schools-Classes/">Dance Schools</a>, <a href="/Category/Education/Music-Schools-Instruction/">Music Schools</a>...
						</td>
						<td valign="top" width="33%">
							<a href="/Category/Home-Services-Furnishings/"><span style="font-weight:bold">Home Services</span></a>
							<br />
							<a href="/Category/Home-Services-Furnishings/Interior-Decorators-Designers/">Decorators</a>, <a href="/Category/Home-Services-Furnishings/Landscape-Decks-Fencing/">Landscapers</a>, <a href="/Category/Home-Services-Furnishings/Plumbers-Sewer-Repair/">Plumbers</a>...
						</td>
						<td valign="top" width="33%">
							<a href="/Category/Real-Estate/"><span style="font-weight:bold">Real Estate</span></a>
							<br />
							<a href="/Category/Real-Estate/Real-Estate-Agents/">Agents</a>, <a href="/Category/Real-Estate/Apartments/">Apartments</a>, <a href="/Category/Real-Estate/Mortgage-Brokers-Lenders/">Mortgages</a>...
						</td>
					</tr>
				</table>
			</td>
		</tr>
		<tr>
			<td style="padding-left:12px">
			
			</td>
			<td align="right" style="padding-right:12px">
				<a href="/all_categories.php" style="font-weight:bold">view all categories >></a>
			</td>
		</tr>
	</table>
</div>