var spez = ""
  if(is_win) {
  if(is_nav4up) { spez = "_ncpc"; }
  if(is_gecko) { spez = "_iepc"; }
  if(is_ie5up) { spez = "_iepc"; }
  }
  if(is_mac) {
  if(is_nav4up) { spez = "_ncmac"; }
  if(is_ie4) { spez = "_iemac"; }
  if(is_ie5up) { spez = "_iemac"; }
  }
  if(is_linux) {
  if(is_nav4up) { spez = "_ncpc"; }
  if(is_gecko) { spez = "_iepc"; }
  if(is_ie5up) { spez = "_iepc"; }
  }
document.writeln('<link rel="stylesheet" href="css/ogi'+spez+'.css" type="text/css">');