btn_home_norm = new Image();
    btn_home_norm.src = "btn_home_norm.gif"
    btn_home_over = new Image();
    btn_home_over.src = "btn_home_over.gif"
    btn_sitemap_norm = new Image();
    btn_sitemap_norm.src = "btn_sitemap_norm.gif"
    btn_sitemap_over = new Image();
    btn_sitemap_over.src = "btn_sitemap_over.gif"
    btn_mail_norm = new Image();
    btn_mail_norm.src = "btn_mail_norm.gif"
    btn_mail_over = new Image();
    btn_mail_over.src = "btn_mail_over.gif"
    btn_1_norm = new Image();
    btn_1_norm.src = "btn_about_norm.gif";
    btn_1_over = new Image();
    btn_1_over.src = "btn_about_over.gif";
    btn_2_norm = new Image();
    btn_2_norm.src = "btn_mx-3_norm.gif";
    btn_2_over = new Image();
    btn_2_over.src = "btn_mx-3_over.gif";
    btn_3_norm = new Image();
    btn_3_norm.src = "btn_gallery_norm.gif";
    btn_3_over = new Image();
    btn_3_over.src = "btn_gallery_over.gif";
    btn_4_norm = new Image();
    btn_4_norm.src = "btn_tutorials_norm.gif";
    btn_4_over = new Image();
    btn_4_over.src = "btn_tutorials_over.gif";
    btn_5_norm = new Image();
    btn_5_norm.src = "btn_guestbook_norm.gif";
    btn_5_over = new Image();
    btn_5_over.src = "btn_guestbook_over.gif";
    btn_6_norm = new Image();
    btn_6_norm.src = "btn_misc_norm.gif";
    btn_6_over = new Image();
    btn_6_over.src = "btn_misc_over.gif";

    function wechsel(bildnr, bildobjekt)
    {window.document.images[bildnr].src = bildobjekt.src;
    }

    function wechsel1(bildnr, bildobjekt)
    {if (btn_1_clicked == 0)
       {window.document.images[bildnr].src = bildobjekt.src;}
    }

    function wechsel2(bildnr, bildobjekt)
    {if (btn_2_clicked == 0)
       {window.document.images[bildnr].src = bildobjekt.src;}
    }

    function wechsel3(bildnr, bildobjekt)
    {if (btn_3_clicked == 0)
       {window.document.images[bildnr].src = bildobjekt.src;}
    }

    function wechsel4(bildnr, bildobjekt)
    {if (btn_4_clicked == 0)
       {window.document.images[bildnr].src = bildobjekt.src;}
    }

    function wechsel5(bildnr, bildobjekt)
    {if (btn_5_clicked == 0)
       {window.document.images[bildnr].src = bildobjekt.src;}
    }

    function wechsel6(bildnr, bildobjekt)
    {if (btn_6_clicked == 0)
       {window.document.images[bildnr].src = bildobjekt.src;}
    }


function berechnen_reifen()
  {var breite_alt = window.document.all.breite_alt.value
   var hoehe_alt = window.document.all.hoehe_alt.value
   var felge_alt = window.document.all.felge_alt.value
   var breite_neu = window.document.all.breite_neu.value
   var hoehe_neu = window.document.all.hoehe_neu.value
   var felge_neu = window.document.all.felge_neu.value
   var radhoehe_alt = 0
   var radhoehe_neu = 0
   var radumfang_alt = 0
   var radumfang_neu = 0
   var abweichung = 0
   var geschw = 0
   var pi = 3.1415926535897932384626433832795
   

   radhoehe_alt = (Math.round(felge_alt) * 2.54) + (2 * ((Math.round(breite_alt / 10) / 100 * Math.round(hoehe_alt))));
   radhoehe_alt = radhoehe_alt * 100;
   radhoehe_alt = Math.round(radhoehe_alt);
   radhoehe_alt = radhoehe_alt / 100;
   radhoehe_neu = (Math.round(felge_neu) * 2.54) + (2 * ((Math.round(breite_neu / 10) / 100 * Math.round(hoehe_neu))));
   radhoehe_neu = radhoehe_neu * 100;
   radhoehe_neu = Math.round(radhoehe_neu);
   radhoehe_neu = radhoehe_neu / 100;

   window.document.all.radhoehe_alt.value = radhoehe_alt;
   window.document.all.radhoehe_neu.value = radhoehe_neu;


   radumfang_alt = pi * radhoehe_alt;
   radumfang_alt = radumfang_alt * 100;
   radumfang_alt = Math.round(radumfang_alt);
   radumfang_alt = radumfang_alt / 100;
   radumfang_neu = pi * radhoehe_neu;
   radumfang_neu = radumfang_neu * 100;
   radumfang_neu = Math.round(radumfang_neu);
   radumfang_neu = radumfang_neu / 100;

   window.document.all.radumfang_alt.value = radumfang_alt;
   window.document.all.radumfang_neu.value = radumfang_neu;


   abweichung = (radumfang_neu / radumfang_alt * 100) - 100;
   abweichung = abweichung * 100;
   abweichung = Math.round(abweichung);
   abweichung = abweichung / 100;

   window.document.all.abweichung.value = abweichung;


   geschw = 100 + abweichung;
   geschw = geschw * 100;
   geschw = Math.round(geschw);
   geschw = geschw / 100;

   window.document.all.geschw.value = geschw;


   if ((abweichung > 2) || (abweichung < -2))
     {window.document.all.justierung.value = "Tachojustierung nötig";
      window.document.all.justierung.style.color = "#FF0000";
     }
   if ((abweichung < 2) && (abweichung > -2))
     {window.document.all.justierung.value = "Tachojustierung nicht nötig";
      window.document.all.justierung.style.color = "#00BF00";
     }

  }




function berechnen_getriebe()
  {var reifenbreite = window.document.all.reifenbreite.value
   var reifenhoehe = window.document.all.reifenhoehe.value
   var felgengroesse = window.document.all.felgengroesse.value
   var ueb1 = window.document.all.gang1.value
   var ueb2 = window.document.all.gang2.value
   var ueb3 = window.document.all.gang3.value
   var ueb4 = window.document.all.gang4.value
   var ueb5 = window.document.all.gang5.value
   var ueb6 = window.document.all.gang6.value
   var achs_ueb = window.document.all.achse.value
   var radhoehe = 0
   var radumfang = 0
   var pi = 3.1415926535897932384626433832795
   var v_1_1000 = 0
   var v_1_1500 = 0
   var v_1_2000 = 0
   var v_1_2500 = 0
   var v_1_3000 = 0
   var v_1_3500 = 0
   var v_1_4000 = 0
   var v_1_4500 = 0
   var v_1_5000 = 0
   var v_1_5500 = 0
   var v_1_6000 = 0
   var v_1_6500 = 0
   var v_1_7000 = 0
   var v_1_7500 = 0
   var v_1_8000 = 0
   var v_1_8500 = 0
   var v_1_9000 = 0
   var v_2_1000 = 0
   var v_2_1500 = 0
   var v_2_2000 = 0
   var v_2_2500 = 0
   var v_2_3000 = 0
   var v_2_3500 = 0
   var v_2_4000 = 0
   var v_2_4500 = 0
   var v_2_5000 = 0
   var v_2_5500 = 0
   var v_2_6000 = 0
   var v_2_6500 = 0
   var v_2_7000 = 0
   var v_2_7500 = 0
   var v_2_8000 = 0
   var v_2_8500 = 0
   var v_2_9000 = 0
   var v_3_1000 = 0
   var v_3_1500 = 0
   var v_3_2000 = 0
   var v_3_2500 = 0
   var v_3_3000 = 0
   var v_3_3500 = 0
   var v_3_4000 = 0
   var v_3_4500 = 0
   var v_3_5000 = 0
   var v_3_5500 = 0
   var v_3_6000 = 0
   var v_3_6500 = 0
   var v_3_7000 = 0
   var v_3_7500 = 0
   var v_3_8000 = 0
   var v_3_8500 = 0
   var v_3_9000 = 0
   var v_4_1000 = 0
   var v_4_1500 = 0
   var v_4_2000 = 0
   var v_4_2500 = 0
   var v_4_3000 = 0
   var v_4_3500 = 0
   var v_4_4000 = 0
   var v_4_4500 = 0
   var v_4_5000 = 0
   var v_4_5500 = 0
   var v_4_6000 = 0
   var v_4_6500 = 0
   var v_4_7000 = 0
   var v_4_7500 = 0
   var v_4_8000 = 0
   var v_4_8500 = 0
   var v_4_9000 = 0
   var v_5_1000 = 0
   var v_5_1500 = 0
   var v_5_2000 = 0
   var v_5_2500 = 0
   var v_5_3000 = 0
   var v_5_3500 = 0
   var v_5_4000 = 0
   var v_5_4500 = 0
   var v_5_5000 = 0
   var v_5_5500 = 0
   var v_5_6000 = 0
   var v_5_6500 = 0
   var v_5_7000 = 0
   var v_5_7500 = 0
   var v_5_8000 = 0
   var v_5_8500 = 0
   var v_5_9000 = 0
   var v_6_1000 = 0
   var v_6_1500 = 0
   var v_6_2000 = 0
   var v_6_2500 = 0
   var v_6_3000 = 0
   var v_6_3500 = 0
   var v_6_4000 = 0
   var v_6_4500 = 0
   var v_6_5000 = 0
   var v_6_5500 = 0
   var v_6_6000 = 0
   var v_6_6500 = 0
   var v_6_7000 = 0
   var v_6_7500 = 0
   var v_6_8000 = 0
   var v_6_8500 = 0
   var v_6_9000 = 0

   radhoehe = (Math.round(felgengroesse) * 2.54) + (2 * (Math.round(reifenbreite) / 10) * (Math.round(reifenhoehe) / 100));
   radumfang = radhoehe * pi / 100;

   v_1_1000 = 1000 * radumfang * 60 / 1000 / ueb1 / achs_ueb;
   v_1_1500 = 1500 * radumfang * 60 / 1000 / ueb1 / achs_ueb;
   v_1_2000 = 2000 * radumfang * 60 / 1000 / ueb1 / achs_ueb;
   v_1_2500 = 2500 * radumfang * 60 / 1000 / ueb1 / achs_ueb;
   v_1_3000 = 3000 * radumfang * 60 / 1000 / ueb1 / achs_ueb;
   v_1_3500 = 3500 * radumfang * 60 / 1000 / ueb1 / achs_ueb;
   v_1_4000 = 4000 * radumfang * 60 / 1000 / ueb1 / achs_ueb;
   v_1_4500 = 4500 * radumfang * 60 / 1000 / ueb1 / achs_ueb;
   v_1_5000 = 5000 * radumfang * 60 / 1000 / ueb1 / achs_ueb;
   v_1_5500 = 5500 * radumfang * 60 / 1000 / ueb1 / achs_ueb;
   v_1_6000 = 6000 * radumfang * 60 / 1000 / ueb1 / achs_ueb;
   v_1_6500 = 6500 * radumfang * 60 / 1000 / ueb1 / achs_ueb;
   v_1_7000 = 7000 * radumfang * 60 / 1000 / ueb1 / achs_ueb;
   v_1_7500 = 7500 * radumfang * 60 / 1000 / ueb1 / achs_ueb;
   v_1_8000 = 8000 * radumfang * 60 / 1000 / ueb1 / achs_ueb;
   v_1_8500 = 8500 * radumfang * 60 / 1000 / ueb1 / achs_ueb;
   v_1_9000 = 9000 * radumfang * 60 / 1000 / ueb1 / achs_ueb;
   v_2_1000 = 1000 * radumfang * 60 / 1000 / ueb2 / achs_ueb;
   v_2_1500 = 1500 * radumfang * 60 / 1000 / ueb2 / achs_ueb;
   v_2_2000 = 2000 * radumfang * 60 / 1000 / ueb2 / achs_ueb;
   v_2_2500 = 2500 * radumfang * 60 / 1000 / ueb2 / achs_ueb;
   v_2_3000 = 3000 * radumfang * 60 / 1000 / ueb2 / achs_ueb;
   v_2_3500 = 3500 * radumfang * 60 / 1000 / ueb2 / achs_ueb;
   v_2_4000 = 4000 * radumfang * 60 / 1000 / ueb2 / achs_ueb;
   v_2_4500 = 4500 * radumfang * 60 / 1000 / ueb2 / achs_ueb;
   v_2_5000 = 5000 * radumfang * 60 / 1000 / ueb2 / achs_ueb;
   v_2_5500 = 5500 * radumfang * 60 / 1000 / ueb2 / achs_ueb;
   v_2_6000 = 6000 * radumfang * 60 / 1000 / ueb2 / achs_ueb;
   v_2_6500 = 6500 * radumfang * 60 / 1000 / ueb2 / achs_ueb;
   v_2_7000 = 7000 * radumfang * 60 / 1000 / ueb2 / achs_ueb;
   v_2_7500 = 7500 * radumfang * 60 / 1000 / ueb2 / achs_ueb;
   v_2_8000 = 8000 * radumfang * 60 / 1000 / ueb2 / achs_ueb;
   v_2_8500 = 8500 * radumfang * 60 / 1000 / ueb2 / achs_ueb;
   v_2_9000 = 9000 * radumfang * 60 / 1000 / ueb2 / achs_ueb;
   v_3_1000 = 1000 * radumfang * 60 / 1000 / ueb3 / achs_ueb;
   v_3_1500 = 1500 * radumfang * 60 / 1000 / ueb3 / achs_ueb;
   v_3_2000 = 2000 * radumfang * 60 / 1000 / ueb3 / achs_ueb;
   v_3_2500 = 2500 * radumfang * 60 / 1000 / ueb3 / achs_ueb;
   v_3_3000 = 3000 * radumfang * 60 / 1000 / ueb3 / achs_ueb;
   v_3_3500 = 3500 * radumfang * 60 / 1000 / ueb3 / achs_ueb;
   v_3_4000 = 4000 * radumfang * 60 / 1000 / ueb3 / achs_ueb;
   v_3_4500 = 4500 * radumfang * 60 / 1000 / ueb3 / achs_ueb;
   v_3_5000 = 5000 * radumfang * 60 / 1000 / ueb3 / achs_ueb;
   v_3_5500 = 5500 * radumfang * 60 / 1000 / ueb3 / achs_ueb;
   v_3_6000 = 6000 * radumfang * 60 / 1000 / ueb3 / achs_ueb;
   v_3_6500 = 6500 * radumfang * 60 / 1000 / ueb3 / achs_ueb;
   v_3_7000 = 7000 * radumfang * 60 / 1000 / ueb3 / achs_ueb;
   v_3_7500 = 7500 * radumfang * 60 / 1000 / ueb3 / achs_ueb;
   v_3_8000 = 8000 * radumfang * 60 / 1000 / ueb3 / achs_ueb;
   v_3_8500 = 8500 * radumfang * 60 / 1000 / ueb3 / achs_ueb;
   v_3_9000 = 9000 * radumfang * 60 / 1000 / ueb3 / achs_ueb;
   v_4_1000 = 1000 * radumfang * 60 / 1000 / ueb4 / achs_ueb;
   v_4_1500 = 1500 * radumfang * 60 / 1000 / ueb4 / achs_ueb;
   v_4_2000 = 2000 * radumfang * 60 / 1000 / ueb4 / achs_ueb;
   v_4_2500 = 2500 * radumfang * 60 / 1000 / ueb4 / achs_ueb;
   v_4_3000 = 3000 * radumfang * 60 / 1000 / ueb4 / achs_ueb;
   v_4_3500 = 3500 * radumfang * 60 / 1000 / ueb4 / achs_ueb;
   v_4_4000 = 4000 * radumfang * 60 / 1000 / ueb4 / achs_ueb;
   v_4_4500 = 4500 * radumfang * 60 / 1000 / ueb4 / achs_ueb;
   v_4_5000 = 5000 * radumfang * 60 / 1000 / ueb4 / achs_ueb;
   v_4_5500 = 5500 * radumfang * 60 / 1000 / ueb4 / achs_ueb;
   v_4_6000 = 6000 * radumfang * 60 / 1000 / ueb4 / achs_ueb;
   v_4_6500 = 6500 * radumfang * 60 / 1000 / ueb4 / achs_ueb;
   v_4_7000 = 7000 * radumfang * 60 / 1000 / ueb4 / achs_ueb;
   v_4_7500 = 7500 * radumfang * 60 / 1000 / ueb4 / achs_ueb;
   v_4_8000 = 8000 * radumfang * 60 / 1000 / ueb4 / achs_ueb;
   v_4_8500 = 8500 * radumfang * 60 / 1000 / ueb4 / achs_ueb;
   v_4_9000 = 9000 * radumfang * 60 / 1000 / ueb4 / achs_ueb;
   v_5_1000 = 1000 * radumfang * 60 / 1000 / ueb5 / achs_ueb;
   v_5_1500 = 1500 * radumfang * 60 / 1000 / ueb5 / achs_ueb;
   v_5_2000 = 2000 * radumfang * 60 / 1000 / ueb5 / achs_ueb;
   v_5_2500 = 2500 * radumfang * 60 / 1000 / ueb5 / achs_ueb;
   v_5_3000 = 3000 * radumfang * 60 / 1000 / ueb5 / achs_ueb;
   v_5_3500 = 3500 * radumfang * 60 / 1000 / ueb5 / achs_ueb;
   v_5_4000 = 4000 * radumfang * 60 / 1000 / ueb5 / achs_ueb;
   v_5_4500 = 4500 * radumfang * 60 / 1000 / ueb5 / achs_ueb;
   v_5_5000 = 5000 * radumfang * 60 / 1000 / ueb5 / achs_ueb;
   v_5_5500 = 5500 * radumfang * 60 / 1000 / ueb5 / achs_ueb;
   v_5_6000 = 6000 * radumfang * 60 / 1000 / ueb5 / achs_ueb;
   v_5_6500 = 6500 * radumfang * 60 / 1000 / ueb5 / achs_ueb;
   v_5_7000 = 7000 * radumfang * 60 / 1000 / ueb5 / achs_ueb;
   v_5_7500 = 7500 * radumfang * 60 / 1000 / ueb5 / achs_ueb;
   v_5_8000 = 8000 * radumfang * 60 / 1000 / ueb5 / achs_ueb;
   v_5_8500 = 8500 * radumfang * 60 / 1000 / ueb5 / achs_ueb;
   v_5_9000 = 9000 * radumfang * 60 / 1000 / ueb5 / achs_ueb;
   v_6_1000 = 1000 * radumfang * 60 / 1000 / ueb6 / achs_ueb;
   v_6_1500 = 1500 * radumfang * 60 / 1000 / ueb6 / achs_ueb;
   v_6_2000 = 2000 * radumfang * 60 / 1000 / ueb6 / achs_ueb;
   v_6_2500 = 2500 * radumfang * 60 / 1000 / ueb6 / achs_ueb;
   v_6_3000 = 3000 * radumfang * 60 / 1000 / ueb6 / achs_ueb;
   v_6_3500 = 3500 * radumfang * 60 / 1000 / ueb6 / achs_ueb;
   v_6_4000 = 4000 * radumfang * 60 / 1000 / ueb6 / achs_ueb;
   v_6_4500 = 4500 * radumfang * 60 / 1000 / ueb6 / achs_ueb;
   v_6_5000 = 5000 * radumfang * 60 / 1000 / ueb6 / achs_ueb;
   v_6_5500 = 5500 * radumfang * 60 / 1000 / ueb6 / achs_ueb;
   v_6_6000 = 6000 * radumfang * 60 / 1000 / ueb6 / achs_ueb;
   v_6_6500 = 6500 * radumfang * 60 / 1000 / ueb6 / achs_ueb;
   v_6_7000 = 7000 * radumfang * 60 / 1000 / ueb6 / achs_ueb;
   v_6_7500 = 7500 * radumfang * 60 / 1000 / ueb6 / achs_ueb;
   v_6_8000 = 8000 * radumfang * 60 / 1000 / ueb6 / achs_ueb;
   v_6_8500 = 8500 * radumfang * 60 / 1000 / ueb6 / achs_ueb;
   v_6_9000 = 9000 * radumfang * 60 / 1000 / ueb6 / achs_ueb;

   window.document.all.textfeld_warnung.value = "";
   if (achs_ueb > 0)
   {
   if ((!isNaN(v_1_1000)) && (v_1_1000 != "Infinity")&& (v_1_1000 != "-Infinity") && (v_1_1000 > "0"))
     {window.document.all.text_v_1_1000.value = Math.round(v_1_1000);}
   if ((!isNaN(v_1_1500)) && (v_1_1500 != "Infinity")&& (v_1_1500 != "-Infinity") && (v_1_1500 > "0"))
     {window.document.all.text_v_1_1500.value = Math.round(v_1_1500);}
   if ((!isNaN(v_1_2000)) && (v_1_2000 != "Infinity")&& (v_1_2000 != "-Infinity") && (v_1_2000 > "0"))
     {window.document.all.text_v_1_2000.value = Math.round(v_1_2000);}
   if ((!isNaN(v_1_2500)) && (v_1_2500 != "Infinity")&& (v_1_2500 != "-Infinity") && (v_1_2500 > "0"))
     {window.document.all.text_v_1_2500.value = Math.round(v_1_2500);}
   if ((!isNaN(v_1_3000)) && (v_1_3000 != "Infinity")&& (v_1_3000 != "-Infinity") && (v_1_3000 > "0"))
     {window.document.all.text_v_1_3000.value = Math.round(v_1_3000);}
   if ((!isNaN(v_1_3500)) && (v_1_3500 != "Infinity")&& (v_1_3500 != "-Infinity") && (v_1_3500 > "0"))
     {window.document.all.text_v_1_3500.value = Math.round(v_1_3500);}
   if ((!isNaN(v_1_4000)) && (v_1_4000 != "Infinity")&& (v_1_4000 != "-Infinity") && (v_1_4000 > "0"))
     {window.document.all.text_v_1_4000.value = Math.round(v_1_4000);}
   if ((!isNaN(v_1_4500)) && (v_1_4500 != "Infinity")&& (v_1_4500 != "-Infinity") && (v_1_4500 > "0"))
     {window.document.all.text_v_1_4500.value = Math.round(v_1_4500);}
   if ((!isNaN(v_1_5000)) && (v_1_5000 != "Infinity")&& (v_1_5000 != "-Infinity") && (v_1_5000 > "0"))
     {window.document.all.text_v_1_5000.value = Math.round(v_1_5000);}
   if ((!isNaN(v_1_5500)) && (v_1_5500 != "Infinity")&& (v_1_5500 != "-Infinity") && (v_1_5500 > "0"))
     {window.document.all.text_v_1_5500.value = Math.round(v_1_5500);}
   if ((!isNaN(v_1_6000)) && (v_1_6000 != "Infinity")&& (v_1_6000 != "-Infinity") && (v_1_6000 > "0"))
     {window.document.all.text_v_1_6000.value = Math.round(v_1_6000);}
   if ((!isNaN(v_1_6500)) && (v_1_6500 != "Infinity")&& (v_1_6500 != "-Infinity") && (v_1_6500 > "0"))
     {window.document.all.text_v_1_6500.value = Math.round(v_1_6500);}
   if ((!isNaN(v_1_7000)) && (v_1_7000 != "Infinity")&& (v_1_7000 != "-Infinity") && (v_1_7000 > "0"))
     {window.document.all.text_v_1_7000.value = Math.round(v_1_7000);}
   if ((!isNaN(v_1_7500)) && (v_1_7500 != "Infinity")&& (v_1_7500 != "-Infinity") && (v_1_7500 > "0"))
     {window.document.all.text_v_1_7500.value = Math.round(v_1_7500);}
   if ((!isNaN(v_1_8000)) && (v_1_8000 != "Infinity")&& (v_1_8000 != "-Infinity") && (v_1_8000 > "0"))
     {window.document.all.text_v_1_8000.value = Math.round(v_1_8000);}
   if ((!isNaN(v_1_8500)) && (v_1_8500 != "Infinity")&& (v_1_8500 != "-Infinity") && (v_1_8500 > "0"))
     {window.document.all.text_v_1_8500.value = Math.round(v_1_8500);}
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