you would need to hand code a javascript on click event to show the div and change the contents, for example:
<form id="form1" name="form1" method="post" action="">
<input type="button" name="button" id="button" value="Button" onClick="document.getElementById('divID').style.visibility = 'visible';document.getElementById('divID').innerHTML ='new content for div'"/>
</form>
<div id="divID" style="visibility: hidden;">this is some text</div>