Need some help with php and a style sheet

I have an issue with a div giving all links a line underneath a dotted one.

Here is partial of the php what I need is for one section to use a different style for its links then the rest.

        <div id="sidebar">

        	<div id="search">
            </div>

            <div class="sideblock">
				<div class="sideblock-title"><h3>some text here</h3></div>

<!-- From here //-->
<div class="adblock" >
<a href="http://website.com"><img src="<?php bloginfo('template_directory'); ?>/img/ad_block.gif" height="125" width="125" border="0" alt="Advertise Here" /></a></div>
<div class="adblock">
<a href="http://website.com"><img src="<?php bloginfo('template_directory'); ?>/img/ad_block.gif" height="125" width="125" border="0" alt="Advertise Here" /></a></div>
<!-- To here //-->

			</div>

            <div class="sideblock">
				<div class="sideblock-title"><h3>some text here</h3>
				</div>
			 </div>
            
            <div class="sideblock">
				<div class="sideblock-title">
				  <h3>Tags</h3>
				</div>
             </div>
            <div class="sideblock">
				<div class="sideblock-title"><h3>some text here</h3></div>
                <div id="adsense-halfbanner">
                    
                </div>
			</div>
                        <div class="sideblock">
				<div class="sideblock-title"><h3>some text here</h3></div>
				<ul>
					<li><a href="#">some text here</a></li>
					<li><a href="#">some text here</a></li>
                    
              </ul>
			</div>

        </div>
        <div style="clear:both;"></div>

PHP:

the area in from here to here is what I need to not have the

#sidebar a {
	border-bottom-width: 1px;
	border-bottom-style: dotted;
	border-bottom-color: #3399FF;
	color: #0066CC;
	text-decoration:none;
}

Code (markup):

All help is appreciated


Thank you

 

div.adblock a { color: purple; etc; etc; }

 

That did not do it

div.adblock a { border-style: none; }

 

No, because you'd asked about text links. Try 'div.adblock a img'