This assumes HTML that looks like this:

<pre><code>
&lt;div id=&quot;containing_div&quot;&gt;
&lt;div id=&quot;div_1&quot; style=&quot;background-color:red&quot; class=&quot;visible_div&quot;&gt;
&lt;p&gt;Test Content 1&lt;/p&gt;
&lt;/div&gt; &lt;!-- div_1 --&gt;
&lt;div id=&quot;div_2&quot; style=&quot;background-color:blue&quot;&gt;
&lt;p&gt;Test Content 2&lt;/p&gt;
&lt;/div&gt; &lt;!-- div_2 --&gt;
&lt;div id=&quot;div_3&quot; style=&quot;background-color:yellow&quot;&gt;
&lt;p&gt;Test Content 3&lt;/p&gt;
&lt;/div&gt; &lt;!-- div_3 --&gt;
&lt;/div&gt; &lt;!-- containing div --&gt;
&lt;ul id=&quot;test_buttons&quot;&gt;
&lt;li&gt;&lt;a href=&quot;#&quot; id=&quot;div_1_link&quot; onclick=&quot;slideDiv(&#x27;div_1&#x27;)&quot; class=&quot;here&quot;&gt;One&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href=&quot;#&quot; id=&quot;div_2_link&quot; onclick=&quot;slideDiv(&#x27;div_2&#x27;)&quot;&gt;Two&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href=&quot;#&quot; id=&quot;div_3_link&quot; onclick=&quot;slideDiv(&#x27;div_3&#x27;)&quot;&gt;Three&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt; &lt;!-- test_buttons --&gt;

</code></pre>


And CSS that looks like this:

.hidden_div {
display: none;
}

.visible_div {
display: block;
}

#containing_div {
width: 300px;
background-color: #ddd;
height: 300px;
overflow:hidden;
}
#containing_div div {
width: 300px;
height: 300px;
}

#test_buttons {
background-color: green;
float: left;
padding: 10px 0 10px 0;
}

#test_buttons li {
display:inline;
float: left;
list-style-type:none;
text-align: center;
}
#test_buttons li a {
display: block;
float: left;
width: 50px;
margin-left: 10px;
height: 15px;
background-color: white;
padding: 8px 4px;
}
#test_buttons li a.here {
background-color: orange;
}
#test_buttons li a.not_here{
background-color: white;
}

Change attributes at will, except for display: none or block.

function slideDiv(divId) { 
	var contDiv = document.getElementById('containing_div'); 
	var divs = contDiv.getElementsByTagName('div'); 
 
            for (var x = 0; x < divs.length; x++){ 
		if (divs[x].id != divId) { 
		   divs[x].className = "hidden_div";
		   document.getElementById(divs[x].id+'_link').className = 'not_here';
		} 
		else if (divs[x].id = divId) { 
		   divs[x].className = "visible_div"; 
		   document.getElementById(divId+'_link').className = 'here';
		} 
	} 
}