Css not displaying images

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ASP.NET

CSS

Hi I have a tab menu on my asp.net page and I can't get the menus to display the required images. Any help is much apreciated, my code:
CSS FILE:
.glossymenu{
position: relative;
padding: 0 0 0 34px;
margin: 0 auto 0 auto;
background-image: url(../Images/menub_bg.gif) repeat-x; /*tab background image path*/
height: 46px;
list-style: none;
}
.glossymenu li{
float:left;
}
.glossymenu li a{
float: left;
display: block;
color:#000;
text-decoration: none;
font-family: sans-serif;
font-size: 13px;
font-weight: bold;
padding:0 0 0 16px; /*Padding to accomodate left tab image. Do not change*/
height: 46px;
line-height: 46px;
text-align: center;
cursor: pointer;
}
.glossymenu li a b{
float: left;
display: block;
padding: 0 24px 0 8px; /*Padding of menu items*/
}
.glossymenu li.current a, .glossymenu li a:hover{
color: #fff;
background-image: url(../Images/menub_hover_left.gif) no-repeat; /*left tab image path*/
background-position: left;
}
.glossymenu li.current a b, .glossymenu li a:hover b{
color: #fff;
background-image: url(../Imagesmenub_hover_right.gif) no-repeat right top; /*right tab image path*/
}

ASP.NET PAGE:

<tr align="center">
<td>
<ul id="countrytabs" class="glossymenu">
<li><a href="#" rel="General">General</a></li>
<li><a href="#" rel="Bill">Bill</a></li>
<li><a href="#" rel="Reconsile">Reconsile</a></li>
<li><a href="#" rel="FixedCharges">Fixed Charges</a></li>
</ul>

Thank you in advance.</td></tr>