function openup(project) {
	oben = (screen.height - 450)/2;
	links = (screen.width - 600)/2;
	referenz = window.open("refer/"+project+"/index.php","Referenz","width=600,height=410,left="+links+",top="+oben);
}

function openleistung() {
	oben = (screen.height - 380)/2;
	links = (screen.width - 600)/2;
	leistung = window.open("leistungen.htm","Leistungsspektrum","width=600,height=350,left="+links+",top="+oben);
}