I've got a problem with a web page I'm working on. I have 4 modules - one of them has 2 tabs, two of them have 4 tabs. When the user clicks on the tabs, the content below them changes. However, when the user clicks on the tab (any tab), the browser goes back to the top of the page (I'm assuming it's refreshing, I'm not sure). I'm attaching the JS code below, along with the 2-tab version of the module and its accompanying CSS. Any help will be greatly appreciated.. thanks!

SteveMTNO

<script type="text/javascript">
window.onload = function() {
document.getElementById('tab2').style.display = 'block';
document.getElementById('tab3').style.display = 'block';
document.getElementById('tab7').style.display = 'block';
var topHeadlinesbutton = document.getElementById('topHeadlinesbutton');
var latestNewsbutton = document.getElementById('latestNewsbutton');
var storiesButton = document.getElementById('storiesButton');
var commentsButton = document.getElementById('commentsButton');
var emailedButton = document.getElementById('emailedButton');
var videoButton = document.getElementById('videoButton');
var jobsbutton = document.getElementById('jobsbutton');
var autosbutton = document.getElementById('autosbutton');
var homesbutton = document.getElementById('homesbutton');
var classifiedsbutton = document.getElementById('classifiedsbutton');
topHeadlinesbutton.onclick = function() {
document.getElementById('tab1').style.display = 'block';
document.getElementById('tab2').style.display = 'none';
}
latestNewsbutton.onclick = function() {
document.getElementById('tab1').style.display = 'none';
document.getElementById('tab2').style.display = 'block';
}
storiesButton.onclick = function() {
document.getElementById('tab3').style.display = 'block';
document.getElementById('tab4').style.display = 'none';
document.getElementById('tab5').style.display = 'none';
document.getElementById('tab6').style.display = 'none';
}
commentsButton.onclick = function() {
document.getElementById('tab3').style.display = 'none';
document.getElementById('tab4').style.display = 'block';
document.getElementById('tab5').style.display = 'none';
document.getElementById('tab6').style.display = 'none';
}
emailedButton.onclick = function() {
document.getElementById('tab3').style.display = 'none';
document.getElementById('tab4').style.display = 'none';
document.getElementById('tab5').style.display = 'block';
document.getElementById('tab6').style.display = 'none';
}
videoButton.onclick = function() {
document.getElementById('tab3').style.display = 'none';
document.getElementById('tab4').style.display = 'none';
document.getElementById('tab5').style.display = 'none';
document.getElementById('tab6').style.display = 'block';
}
jobsbutton.onclick = function() {
document.getElementById('tab7').style.display = 'block';
document.getElementById('tab8').style.display = 'none';
document.getElementById('tab9').style.display = 'none';
document.getElementById('tab10').style.display = 'none';
}
autosbutton.onclick = function() {
document.getElementById('tab7').style.display = 'none';
document.getElementById('tab8').style.display = 'block';
document.getElementById('tab9').style.display = 'none';
document.getElementById('tab10').style.display = 'none';
}
homesbutton.onclick = function() {
document.getElementById('tab7').style.display = 'none';
document.getElementById('tab8').style.display = 'none';
document.getElementById('tab9').style.display = 'block';
document.getElementById('tab10').style.display = 'none';
}
classifiedsbutton.onclick = function() {
document.getElementById('tab7').style.display = 'none';
document.getElementById('tab8').style.display = 'none';
document.getElementById('tab9').style.display = 'none';
document.getElementById('tab10').style.display = 'block';
}
}
</script>


<div id="background">

<div id="tabs">
<ul>
<li><a href="#" title="topHeadlines" id="topHeadlinesbutton"><span>Top headlines</span></a></li>
<li><a href="#" title="latestNews" id="latestNewsbutton"><span>Latest news</span></a></li>
</ul>
</div>

<div id="tab1">
<div id="topHeadlines">
<div class="content">
<ul>
<li>Top headlines will go here</li>
</ul>
</div>
</div>
</div>

<div id="tab2">
<div id="latestNews">
<div class="content">
<ul>
<li>
<script language="javascript" type="text/javascript" src="http://images.stltoday.com/stltoday/js/com_stltoday_rss.js"></script>
<div>
<a href="/news" class="rss_title">Latest News</a>
</div>
<div id="latest_news_rss" class="rss_item">loading...</div>
<script language="javascript" type="text/javascript">
<!--
try {
rss1 = new com_stltoday_rss_reader("latest_news_rss");
rss1.getRSS("/rss/news",12);
} catch(e) {
document.getElementById("latest_news_rss").innerHTML="Currently offline, please try later...";
};
//-->
</script>
</li>
</ul>
</div>
</div>
</div>
</div>


<style type="text/css">

img {
border: none;
}

a {
text-decoration: none;
color: #000;
}

ul {
list-style:none;
}

#background {
width: 300px;
height: 229px;
position: relative;
background-color: white;
}

#background #tabs {
width:300px;
height: 21px;
position: relative;
top:-1px;
left:-6px;
line-height:normal;
}

#background #tabs ul {
margin:0px;
padding:0px 0px 0px 5px;
}

#background #tabs li {
display:inline;
margin:0px;
padding:0px;
}

#background #tabs a {
float:left;
background:url("http://images.stltoday.com/stltoday/images/tableft.gif") no-repeat left top;
margin:0px;
padding:0px 0px 0px 4px;
}

#background #tabs a span {
float:left;
display:block;
background:url("http://images.stltoday.com/stltoday/images/tabright.gif") no-repeat right top;
padding:5px 15px 4px 6px;
color:#fff;
font-weight: bold;
font-size: 12px;
}

/* Commented Backslash Hack hides rule from IE5-Mac \*/

#background #tabs a span {
float:none;
}

/* End IE5-Mac hack */

#background #tabs a:hover span {
color:#fff;
}

#background #tabs a:hover {
background-position:0% -42px;
}

#background #tabs a:hover span {
background-position:100% -42px;
}

#background #tab1, #background #tab2 {
width: 299px;
height: 228px;
border: 1px solid black;
position: relative;
left:-1px;
display: none;
background-color: white;
}

#background #tab3, #background #tab4, #background #tab5, #background #tab6, #background #tab7, #background #tab8, #background #tab9, #background #tab10 {
width: 299px;
height: 278px;
border: 1px solid black;
left:-1px;
display: none;
background-color: white;
}

#background #tab1 ul, #background #tab2 ul, #background #tab3 ul, #background #tab4 ul, #background #tab5 ul, #background #tab6 ul, #background #tab7 ul, #background #tab8 ul, #background #tab9 ul, #background #tab10 ul {
list-style: none;
padding: 0px; /* this is needed for non-IE browsers */
margin-left: 0px;
font-family: sans-serif;
font-size: 12px;
}

#background #tab1 #topHeadlines a:hover, #background #tab2 #latestNews a:hover, #background #tab3 #stories a:hover, #background #tab4 #comments a:hover, #background #tab5 #emailed a:hover, #background #tab6 #videos a:hover, #background #tab7 #stories a:hover, #background #tab8 #comments a:hover, #background #tab9 #emailed a:hover, #background #tab10 #videos a:hover {
text-decoration: underline;
}

#background .content {
width: 300px;
height: 229px;
margin-left: 10px;
float: left;
padding-top: 10px;
}

#background .content2 {
width: 300px;
height: 279px;
margin-left: 10px;
float: left;
padding-top: 10px;
}

#background .left {
width: 155px;
height: 259px;
margin-top: 10px;
margin-left: 10px;
float: left;
}

#background .right {
width: 115px;
height: 259px;
margin-top: 10px;
margin-left: 10px;
border-left: 1px solid #e5e5e5;
float: right; /* this needs to be here for non_IE browsers to display properly */
}

</style>