this is nearly nice, but not right centered :-)
<script type="text/javascript" src="google_javascript/wagmp_maps.js">/*wagmp*/</script>
<script type="text/javascript">
<!--
var TabbedPanels1 = new Spry.Widget.TabbedPanels("TabbedPanels1", {defaultTab:1});
window.onload = function(){ TabbedPanels1.showPanel(0); };
//-->
</script>
someone from the google forum toold, that I have to insert a new size in the webassist created php file.
var map = new GMap2(document.getElementById('wagmp_map_1'),{size:new GSize(300,300)});
but it is not really centered :-(