function calculatePopupCentering(xSize,ySize)
{
	var w = screen.availWidth;
	var h = screen.availHeight;
	var x = (w-xSize)/2;
	var y  = (h-ySize)/2;
	if (x < 0) {x = 0};
	if (y < 0) {y = 0};
	
	return Array(x,y,w,h);	
}

function splashFlyPopup(url,action)
{
	var w = 900;
	var h = 680;
	var aBuffer = calculatePopupCentering(w,h);
	var x = aBuffer[0];
	var y = aBuffer[1];	
	
	fenster = window.open(url + "&action=" + action, "", "left=" + x + ",top=" + y + ",width=" + w + ",height=" + h + ",resizable=yes,scrollbars=yes");
	fenster.focus();
}