OK...here's something that works:
<script language="javascript">
function changewindow (page) {
document.mywindow.innerHTML='<iframe src="' & page & '" width=540 height=360 name="window" frameborder=1></iframe>';
}
</script>
<a href="javascript:changewindow('games.php');">Click Here for Games</a>
<div id="mywindow">Welcome!</div>
And so on...you get the idea...Basically, when you click the link, the javascript changes whatever is inside the <div></div> tags...in this case to a page called games.php which is in an IFRAME.
Lewis