function kalenderPopup(sida) {
  if (navigator.userAgent.indexOf('MSIE')==-1 && navigator.userAgent.indexOf('illa/3')>0 ) 
  {
    kalender = window.open(sida, 'hotell','resizable=yes,scrollbars=yes,width=370,height=370');
    window.open('','hotell');
    kalender.focus();
  }
  else 
  {
    kalender = window.open(sida,'hotell','resizable=yes,scrollbars=yes,width=370,height=370');
    kalender.focus();
  }
}