ich habe es so gemacht:
<script language="JavaScript" type="text/javascript">
var fenster;
function popup()
{
fenster=window.open("map.php","fwo","width=750,height=580");
fenster.focus;
}
function closepopup()
{
fenster.close();
}
</script>
<a href="javascript:popup();">Welt betreten</a><br>...