function startTour () {
	if(Prototype.Browser.IE) {
 		var popupfenster = window.open('flashtour/tennisuptour.html','','width=665,height=525,status=no,scrollbars=no,resizable=yes');
	 	popupfenster.focus();	
	}
	else {
 		var popupfenster = window.open('flashtour/tennisuptour.html','','width=660,height=525,status=no,scrollbars=no,resizable=yes');
	 	popupfenster.focus();
	}
}