function open_function(url,width,height,options) {
  self.msgWindow = open(url, "Window", "width=" + width + ",height=" + height
    + ",screenX=" + (screen.width-width)/2
    + ",screenY=" + (screen.height-height)/2
    + ",dependent=yes"
    + ",left=" + (screen.width-width)/2
    + ",top=" + (screen.height-height)/2
    + options
    );
  if (self.msgWindow) {
     self.msgWindow.focus();
    if (self.msgWindow.opener == null) self.msgWindow.opener = self;
  }
}
//
// Zum Anzeigen der Druckversion
//
function open_print_window(id) {
  var url="in"+"dex_print_ger.html"; // evil hack!!
  self.msgWindow = open(url, "printWindow", "width=" + screen.height/1.41 + ",height=" + screen.height
    + ",screenX=0"
    + ",screenY=0"
    + ",menubar=yes, resizable=yes, scrollbars=yes, dependent=yes"
    + ",left=0"
    + ",top=0"
    );
  if (self.msgWindow) {
    self.msgWindow.focus();
    if (self.msgWindow.opener == null) self.msgWindow.opener = self;
  }
}
//
// Zum Anzeigen von Anmeldekupons
//
function open_kupon_window() {
  var url="anmeldung/in"+"dex_print_ger.html"; // evil hack!!
  self.msgWindow = open(url, "printWindow", "width=" + screen.height/1.41 + ",height=" + screen.height
    + ",screenX=0"
    + ",screenY=0"
    + ",menubar=yes, resizable=yes, scrollbars=yes, dependent=yes"
    + ",left=0"
    + ",top=0"
    );
  if (self.msgWindow) {
    self.msgWindow.focus();
    if (self.msgWindow.opener == null) self.msgWindow.opener = self;
  }
}