function popUpper(URL, sizeX, sizeY){
	var screenBreite = screen.width;
	var scteenHoehe = screen.height;
	var popUpperX = (screenBreite / 2) - (sizeX / 2);
	var popUpperY = (scteenHoehe / 2) - (sizeY / 2);
	if(sizeX==undefined) { sizeX = 535;}
	if(sizeY==undefined) { sizeY = 325;}
	
	popUpperAttr = "width="+sizeX+",height="+sizeY+",scrollbars=no,top="+popUpperY+",left="+popUpperX;

	var base = '';
	if ( URL.indexOf('/') !== 0 ) {
		base = baseUrl;
	}
	var popup = window.open(base + URL, 'popup', popUpperAttr);
	popup.focus();
	return false;
}