datetoday = new Date();
act = datetoday.getMonth()+1;
esp = datetoday.getDate(datetoday.toGMTString(datetoday.getMonth));
h = datetoday.getHours(datetoday.toGMTString(datetoday.getHours));
var image = "";

if (act == 1 && esp == 1) image ="<img src=logo/logo_neujahr.gif width=207 height=109>";
else if (act == 1) image ="<img src=logo/logo_winter.gif width=207 height=109>";
if (act == 2) image ="<img src=logo/logo_winter.gif width=207 height=109>";
if (act == 3) image ="<img src=logo/logo_ostern.gif width=207 height=109>";
if (act == 4) image ="<img src=logo/logo_fruehling.gif width=207 height=109>";
if (act == 5) image ="<img src=logo/logo_fruehling.gif width=207 height=109>";
if (act == 6) image ="<img src=logo/logo_sommer.gif width=207 height=109>";
if (act == 7) image ="<img src=logo/logo_sommer.gif width=207 height=109>";
if (act == 8) image ="<img src=logo/logo_sommer.gif width=207 height=109>";
if (act == 9) image ="<img src=logo/logo_herbst.gif width=207 height=109>";
if (act == 10) image ="<img src=logo/logo_halloween.gif width=207 height=109>";
if (act == 11) image ="<img src=logo/logo_winter.gif width=207 height=109>";
if (act == 12 && esp == 24 && h > 16) image ="<img src=logo/logo_weihnacht2.gif width=207 height=109>";
else if (act == 12 && esp == 31) image ="<img src=logo/logo_neujahr.gif width=207 height=109>";
else if (act == 12) image ="<img src=logo/logo_weihnacht.gif width=207 height=109>";

document.write(image);