You can use javascript for that, just make a function
function Display()
{
document.getElementById('showcontrol').style.display = 'block';
}
and call that on button click, like this
<html>
<body>
<my id="showcontrol" control="" style="display: none;" />
<input type="submit" value="submit" önclick="Display()" />
</body>
</html>
[UPDATE]
try this:
<HTML>
<HEAD>
<SCRIPT LANGUAGE="JavaScript">
Refer
this [
^]for further reading.
hope it helps :)