if (document.images) {
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  projects_start_f2 = new Image(62 ,12); projects_start_f2.src = "images/projects_start_f4.gif";
  projects_start_f1 = new Image(62 ,12); projects_start_f1.src = "images/projects_start.gif";
  projects_start_f3 = new Image(62 ,12); projects_start_f3.src = "images/projects_start_f3.gif";
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  methods_start_f2 = new Image(111 ,11); methods_start_f2.src = "images/methods_start_f4.gif";
  methods_start_f1 = new Image(111 ,11); methods_start_f1.src = "images/methods_start.gif";
  methods_start_f3 = new Image(111 ,11); methods_start_f3.src = "images/methods_start_f3.gif";
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  lectures_start_f3 = new Image(62 ,11); lectures_start_f3.src = "images/lectures_start_f3.gif";
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  publications_start_f2 = new Image(83 ,12); publications_start_f2.src = "images/publications_start_f4.gif";
  publications_start_f1 = new Image(83 ,12); publications_start_f1.src = "images/publications_start.gif";
  publications_start_f3 = new Image(83 ,12); publications_start_f3.src = "images/publications_start_f3.gif";
  contact_start_f2 = new Image(66 ,11); contact_start_f2.src = "images/contact_start_f2.gif";
  contact_start_f2 = new Image(66 ,11); contact_start_f2.src = "images/contact_start_f4.gif";
  contact_start_f1 = new Image(66 ,11); contact_start_f1.src = "images/contact_start.gif";
  contact_start_f3 = new Image(66 ,11); contact_start_f3.src = "images/contact_start_f3.gif";
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  links_start_f2 = new Image(44 ,11); links_start_f2.src = "images/links_start_f4.gif";
  links_start_f1 = new Image(44 ,11); links_start_f1.src = "images/links_start.gif";
  links_start_f3 = new Image(44 ,11); links_start_f3.src = "images/links_start_f3.gif";
  deutsch_f2 = new Image(58 ,8); deutsch_f2.src = "images/deutsch_f2.gif";
  deutsch_f2 = new Image(58 ,8); deutsch_f2.src = "images/deutsch_f4.gif";
  deutsch_f1 = new Image(58 ,8); deutsch_f1.src = "images/deutsch.gif";
  deutsch_f3 = new Image(58 ,8); deutsch_f3.src = "images/deutsch_f3.gif";
  english_f2 = new Image(54 ,11); english_f2.src = "images/english_f2.gif";
  english_f2 = new Image(54 ,11); english_f2.src = "images/english_f4.gif";
  english_f1 = new Image(54 ,11); english_f1.src = "images/english.gif";
  english_f3 = new Image(54 ,11); english_f3.src = "images/english_f3.gif";


  impulse_logo_f2 = new Image(142 ,68); impulse_logo_f2.src = "images/impulse_logo_f2.gif";
  impulse_logo_f2 = new Image(142 ,68); impulse_logo_f2.src = "images/impulse_logo_f3.gif";
  impulse_logo_f1 = new Image(142 ,68); impulse_logo_f1.src = "images/impulse_logo.gif";
  home_f2 = new Image(27 ,27); home_f2.src = "images/home_f2.gif";
  home_f2 = new Image(27 ,27); home_f2.src = "images/home_f3.gif";
  home_f1 = new Image(27 ,27); home_f1.src = "images/home.gif";
  projects_f2 = new Image(38 ,27); projects_f2.src = "images/projects_f2.gif";
  projects_f2 = new Image(38 ,27); projects_f2.src = "images/projects_f3.gif";
  projects_f1 = new Image(38 ,27); projects_f1.src = "images/projects.gif";
  methods_f2 = new Image(82 ,27); methods_f2.src = "images/methods_f2.gif";
  methods_f2 = new Image(82 ,27); methods_f2.src = "images/methods_f3.gif";
  methods_f1 = new Image(82 ,27); methods_f1.src = "images/methods.gif";
  lectures_f2 = new Image(38 ,27); lectures_f2.src = "images/lectures_f2.gif";
  lectures_f2 = new Image(38 ,27); lectures_f2.src = "images/lectures_f3.gif";
  lectures_f1 = new Image(38 ,27); lectures_f1.src = "images/lectures.gif";
  publications_f2 = new Image(58 ,27); publications_f2.src = "images/publications_f2.gif";
  publications_f2 = new Image(58 ,27); publications_f2.src = "images/publications_f3.gif";
  publications_f1 = new Image(58 ,27); publications_f1.src = "images/publications.gif";
  staff_f2 = new Image(42 ,27); staff_f2.src = "images/staff_f2.gif";
  staff_f2 = new Image(42 ,27); staff_f2.src = "images/staff_f3.gif";
  staff_f1 = new Image(42 ,27); staff_f1.src = "images/staff.gif";
  links_f2 = new Image(22 ,27); links_f2.src = "images/links_f2.gif";
  links_f2 = new Image(22 ,27); links_f2.src = "images/links_f3.gif";
  links_f1 = new Image(22 ,27); links_f1.src = "images/links.gif";

  iczmbutton_f2 = new Image(40 ,8); iczmbutton_f2.src = "images/iczmbutton_f2.gif";
  iczmbutton_f2 = new Image(40 ,8); iczmbutton_f2.src = "images/iczmbutton_f3.gif";
  iczmbutton_f1 = new Image(40 ,8); iczmbutton_f1.src = "images/iczmbutton.gif";
  oilbutton_f2 = new Image(54 ,10); oilbutton_f2.src = "images/oilbutton_f2.gif";
  oilbutton_f2 = new Image(54 ,10); oilbutton_f2.src = "images/oilbutton_f3.gif";
  oilbutton_f1 = new Image(54 ,10); oilbutton_f1.src = "images/oilbutton.gif";
  maributton_en_f2 = new Image(65 ,8); maributton_en_f2.src = "images/maributton_en_f2.gif";
  maributton_en_f2 = new Image(65 ,8); maributton_en_f2.src = "images/maributton_en_f3.gif";
  maributton_en_f1 = new Image(65 ,8); maributton_en_f1.src = "images/maributton_en.gif";
  cablebutton_f2 = new Image(93 ,8); cablebutton_f2.src = "images/cablebutton_f2.gif";
  cablebutton_f2 = new Image(93 ,8); cablebutton_f2.src = "images/cablebutton_f3.gif";
  cablebutton_f1 = new Image(93 ,8); cablebutton_f1.src = "images/cablebutton.gif";

  methodsbutton_f2 = new Image(54 ,8); methodsbutton_f2.src = "images/methodsbutton_f2.gif";
  methodsbutton_f2 = new Image(54 ,8); methodsbutton_f2.src = "images/methodsbutton_f3.gif";
  methodsbutton_f1 = new Image(54 ,8); methodsbutton_f1.src = "images/methodsbutton.gif";
  modelsbutton_f2 = new Image(48 ,8); modelsbutton_f2.src = "images/modelsbutton_f2.gif";
  modelsbutton_f2 = new Image(48 ,8); modelsbutton_f2.src = "images/modelsbutton_f3.gif";
  modelsbutton_f1 = new Image(48 ,8); modelsbutton_f1.src = "images/modelsbutton.gif";

  wtbutton_f2 = new Image(70 ,8); wtbutton_f2.src = "images/wtbutton_f2.gif";
  wtbutton_f2 = new Image(70 ,8); wtbutton_f2.src = "images/wtbutton_f3.gif";
  wtbutton_f1 = new Image(70 ,8); wtbutton_f1.src = "images/wtbutton.gif";
  stbutton_f2 = new Image(79 ,8); stbutton_f2.src = "images/stbutton_f2.gif";
  stbutton_f2 = new Image(79 ,8); stbutton_f2.src = "images/stbutton_f3.gif";
  stbutton_f1 = new Image(79 ,8); stbutton_f1.src = "images/stbutton.gif";

  paper2button_f2 = new Image(48 ,10); paper2button_f2.src = "images/paper2button_f2.gif";
  paper2button_f2 = new Image(48 ,10); paper2button_f2.src = "images/paper2button_f3.gif";
  paper2button_f1 = new Image(48 ,10); paper2button_f1.src = "images/paper2button.gif";
  thesisbutton_f2 = new Image(45 ,8); thesisbutton_f2.src = "images/thesisbutton_f2.gif";
  thesisbutton_f2 = new Image(45 ,8); thesisbutton_f2.src = "images/thesisbutton_f3.gif";
  thesisbutton_f1 = new Image(45 ,8); thesisbutton_f1.src = "images/thesisbutton.gif";
  presbutton_f2 = new Image(45 ,8); presbutton_f2.src = "images/presbutton_f2.gif";
  presbutton_f2 = new Image(45 ,8); presbutton_f2.src = "images/presbutton_f3.gif";
  presbutton_f1 = new Image(45 ,8); presbutton_f1.src = "images/presbutton.gif";

  contactbutton_f2 = new Image(51 ,8); contactbutton_f2.src = "images/contactbutton_f2.gif";
  contactbutton_f2 = new Image(51 ,8); contactbutton_f2.src = "images/contactbutton_f3.gif";
  contactbutton_f1 = new Image(51 ,8); contactbutton_f1.src = "images/contactbutton.gif";
  staffbutton_f2 = new Image(37 ,8); staffbutton_f2.src = "images/staffbutton_f2.gif";
  staffbutton_f2 = new Image(37 ,8); staffbutton_f2.src = "images/staffbutton_f3.gif";
  staffbutton_f1 = new Image(37 ,8); staffbutton_f1.src = "images/staffbutton.gif";
  therebutton_f2 = new Image(77 ,10); therebutton_f2.src = "images/therebutton_f2.gif";
  therebutton_f2 = new Image(77 ,10); therebutton_f2.src = "images/therebutton_f3.gif";
  therebutton_f1 = new Image(77 ,10); therebutton_f1.src = "images/therebutton.gif";

  nationalbutton_f2 = new Image(52 ,8); nationalbutton_f2.src = "images/nationalbutton_f2.gif";
  nationalbutton_f2 = new Image(52 ,8); nationalbutton_f2.src = "images/nationalbutton_f3.gif";
  nationalbutton_f1 = new Image(52 ,8); nationalbutton_f1.src = "images/nationalbutton.gif";
  internationalbutton_f2 = new Image(71 ,8); internationalbutton_f2.src = "images/internationalbutton_f2.gif";
  internationalbutton_f2 = new Image(71 ,8); internationalbutton_f2.src = "images/internationalbutton_f3.gif";
  internationalbutton_f1 = new Image(71 ,8); internationalbutton_f1.src = "images/internationalbutton.gif";
  }