function berechnen(form)
{
var monatvalue = form.monat.value;
var preisgruppevalue = Number(form.preisgruppe.value);
var sekundenvalue = Number(form.sekunden.value);

if (isNaN(sekundenvalue)) {
document.getElementById("preistext").firstChild.nodeValue = " ";
document.getElementById("sekundenfehler").firstChild.nodeValue = "Bitte geben Sie eine ganze Zahl ein.";
document.getElementById("preis").firstChild.nodeValue = " ";
  }
else{
var monat = new Array();

monat["januar"] = new Object();
monat["januar"][01] = "152";
monat["januar"][02] = "192";
monat["januar"][03] = "202";
monat["januar"][04] = "255";
monat["januar"][05] = "278";
monat["januar"][06] = "303";
monat["januar"][07] = "323";
monat["januar"][08] = "343";
monat["januar"][09] = "388";
monat["januar"][10] = "424";
monat["januar"][11] = "445";
monat["januar"][12] = "455";
monat["januar"][13] = "491";
monat["januar"][14] = "527";
monat["januar"][15] = "539";
monat["januar"][16] = "606";
monat["januar"][17] = "646";
monat["januar"][18] = "707";
monat["januar"][19] = "742";
monat["januar"][20] = "773";
monat["januar"][25] = "388";
monat["januar"][30] = "540";
monat["januar"][41] = "685";
monat["januar"][43] = "840";
monat["januar"][45] = "919";
monat["januar"][46] = "929";
monat["januar"][52] = "1124";
monat["januar"][53] = "1236";

monat["februar"] = new Object();
monat["februar"][01] = "180";
monat["februar"][02] = "228";
monat["februar"][03] = "240";
monat["februar"][04] = "302";
monat["februar"][05] = "330";
monat["februar"][06] = "360";
monat["februar"][07] = "384";
monat["februar"][08] = "408";
monat["februar"][09] = "461";
monat["februar"][10] = "504";
monat["februar"][11] = "529";
monat["februar"][12] = "540";
monat["februar"][13] = "583";
monat["februar"][14] = "626";
monat["februar"][15] = "641";
monat["februar"][16] = "720";
monat["februar"][17] = "768";
monat["februar"][18] = "840";
monat["februar"][19] = "882";
monat["februar"][20] = "918";
monat["februar"][25] = "461";
monat["februar"][30] = "642";
monat["februar"][41] = "814";
monat["februar"][43] = "998";
monat["februar"][45] = "1092";
monat["februar"][46] = "1104";
monat["februar"][52] = "1336";
monat["februar"][53] = "1469";

monat["maerz"] = new Object();
monat["maerz"][01] = "180";
monat["maerz"][02] = "228";
monat["maerz"][03] = "240";
monat["maerz"][04] = "302";
monat["maerz"][05] = "330";
monat["maerz"][06] = "360";
monat["maerz"][07] = "384";
monat["maerz"][08] = "408";
monat["maerz"][09] = "461";
monat["maerz"][10] = "504";
monat["maerz"][11] = "529";
monat["maerz"][12] = "540";
monat["maerz"][13] = "583";
monat["maerz"][14] = "626";
monat["maerz"][15] = "641";
monat["maerz"][16] = "720";
monat["maerz"][17] = "768";
monat["maerz"][18] = "840";
monat["maerz"][19] = "882";
monat["maerz"][20] = "918";
monat["maerz"][25] = "461";
monat["maerz"][30] = "642";
monat["maerz"][41] = "814";
monat["maerz"][43] = "998";
monat["maerz"][45] = "1092";
monat["maerz"][46] = "1104";
monat["maerz"][52] = "1336";
monat["maerz"][53] = "1469";

monat["april"] = new Object();
monat["april"][01] = "171";
monat["april"][02] = "217";
monat["april"][03] = "228";
monat["april"][04] = "287";
monat["april"][05] = "314";
monat["april"][06] = "342";
monat["april"][07] = "365";
monat["april"][08] = "388";
monat["april"][09] = "438";
monat["april"][10] = "479";
monat["april"][11] = "503";
monat["april"][12] = "513";
monat["april"][13] = "554";
monat["april"][14] = "595";
monat["april"][15] = "609";
monat["april"][16] = "684";
monat["april"][17] = "730";
monat["april"][18] = "798";
monat["april"][19] = "838";
monat["april"][20] = "872";
monat["april"][25] = "438";
monat["april"][30] = "610";
monat["april"][41] = "773";
monat["april"][43] = "948";
monat["april"][45] = "1037";
monat["april"][46] = "1049";
monat["april"][52] = "1269";
monat["april"][53] = "1395";

monat["mai"] = new Object();
monat["mai"][01] = "165";
monat["mai"][02] = "209";
monat["mai"][03] = "220";
monat["mai"][04] = "277";
monat["mai"][05] = "303";
monat["mai"][06] = "330";
monat["mai"][07] = "352";
monat["mai"][08] = "374";
monat["mai"][09] = "422";
monat["mai"][10] = "462";
monat["mai"][11] = "485";
monat["mai"][12] = "495";
monat["mai"][13] = "535";
monat["mai"][14] = "574";
monat["mai"][15] = "587";
monat["mai"][16] = "660";
monat["mai"][17] = "704";
monat["mai"][18] = "770";
monat["mai"][19] = "809";
monat["mai"][20] = "842";
monat["mai"][25] = "422";
monat["mai"][30] = "589";
monat["mai"][41] = "746";
monat["mai"][43] = "915";
monat["mai"][45] = "1001";
monat["mai"][46] = "1012";
monat["mai"][52] = "1224";
monat["mai"][53] = "1346";

monat["juni"] = new Object();
monat["juni"][01] = "114";
monat["juni"][02] = "144";
monat["juni"][03] = "152";
monat["juni"][04] = "192";
monat["juni"][05] = "209";
monat["juni"][06] = "228";
monat["juni"][07] = "243";
monat["juni"][08] = "258";
monat["juni"][09] = "292";
monat["juni"][10] = "319";
monat["juni"][11] = "335";
monat["juni"][12] = "342";
monat["juni"][13] = "369";
monat["juni"][14] = "397";
monat["juni"][15] = "406";
monat["juni"][16] = "456";
monat["juni"][17] = "486";
monat["juni"][18] = "532";
monat["juni"][19] = "559";
monat["juni"][20] = "581";
monat["juni"][25] = "292";
monat["juni"][30] = "407";
monat["juni"][41] = "515";
monat["juni"][43] = "632";
monat["juni"][45] = "692";
monat["juni"][46] = "699";
monat["juni"][52] = "846";
monat["juni"][53] = "930";

monat["juli"] = new Object();
monat["juli"][01] = "95";
monat["juli"][02] = "120";
monat["juli"][03] = "126";
monat["juli"][04] = "159";
monat["juli"][05] = "173";
monat["juli"][06] = "189";
monat["juli"][07] = "202";
monat["juli"][08] = "214";
monat["juli"][09] = "242";
monat["juli"][10] = "265";
monat["juli"][11] = "278";
monat["juli"][12] = "284";
monat["juli"][13] = "306";
monat["juli"][14] = "329";
monat["juli"][15] = "336";
monat["juli"][16] = "378";
monat["juli"][17] = "403";
monat["juli"][18] = "441";
monat["juli"][19] = "463";
monat["juli"][20] = "482";
monat["juli"][25] = "242";
monat["juli"][30] = "337";
monat["juli"][41] = "427";
monat["juli"][43] = "524";
monat["juli"][45] = "573";
monat["juli"][46] = "580";
monat["juli"][52] = "701";
monat["juli"][53] = "771";

monat["august"] = new Object();
monat["august"][01] = "96";
monat["august"][02] = "122";
monat["august"][03] = "128";
monat["august"][04] = "161";
monat["august"][05] = "176";
monat["august"][06] = "192";
monat["august"][07] = "205";
monat["august"][08] = "218";
monat["august"][09] = "246";
monat["august"][10] = "269";
monat["august"][11] = "282";
monat["august"][12] = "288";
monat["august"][13] = "311";
monat["august"][14] = "334";
monat["august"][15] = "342";
monat["august"][16] = "384";
monat["august"][17] = "410";
monat["august"][18] = "448";
monat["august"][19] = "470";
monat["august"][20] = "490";
monat["august"][25] = "246";
monat["august"][30] = "342";
monat["august"][41] = "434";
monat["august"][43] = "532";
monat["august"][45] = "582";
monat["august"][46] = "589";
monat["august"][52] = "712";
monat["august"][53] = "783";

monat["september"] = new Object();
monat["september"][01] = "138";
monat["september"][02] = "175";
monat["september"][03] = "184";
monat["september"][04] = "232";
monat["september"][05] = "253";
monat["september"][06] = "276";
monat["september"][07] = "294";
monat["september"][08] = "313";
monat["september"][09] = "353";
monat["september"][10] = "386";
monat["september"][11] = "406";
monat["september"][12] = "414";
monat["september"][13] = "447";
monat["september"][14] = "480";
monat["september"][15] = "491";
monat["september"][16] = "552";
monat["september"][17] = "589";
monat["september"][18] = "644";
monat["september"][19] = "676";
monat["september"][20] = "704";
monat["september"][25] = "353";
monat["september"][30] = "492";
monat["september"][41] = "624";
monat["september"][43] = "765";
monat["september"][45] = "837";
monat["september"][46] = "846";
monat["september"][52] = "1024";
monat["september"][53] = "1126";

monat["oktober"] = new Object();
monat["oktober"][01] = "171";
monat["oktober"][02] = "217";
monat["oktober"][03] = "228";
monat["oktober"][04] = "287";
monat["oktober"][05] = "314";
monat["oktober"][06] = "342";
monat["oktober"][07] = "365";
monat["oktober"][08] = "388";
monat["oktober"][09] = "438";
monat["oktober"][10] = "479";
monat["oktober"][11] = "503";
monat["oktober"][12] = "513";
monat["oktober"][13] = "554";
monat["oktober"][14] = "595";
monat["oktober"][15] = "609";
monat["oktober"][16] = "684";
monat["oktober"][17] = "730";
monat["oktober"][18] = "798";
monat["oktober"][19] = "838";
monat["oktober"][20] = "872";
monat["oktober"][25] = "438";
monat["oktober"][30] = "610";
monat["oktober"][41] = "773";
monat["oktober"][43] = "948";
monat["oktober"][45] = "1037";
monat["oktober"][46] = "1049";
monat["oktober"][52] = "1269";
monat["oktober"][53] = "1395";

monat["november"] = new Object();
monat["november"][01] = "180";
monat["november"][02] = "228";
monat["november"][03] = "240";
monat["november"][04] = "302";
monat["november"][05] = "330";
monat["november"][06] = "360";
monat["november"][07] = "384";
monat["november"][08] = "408";
monat["november"][09] = "461";
monat["november"][10] = "504";
monat["november"][11] = "529";
monat["november"][12] = "540";
monat["november"][13] = "583";
monat["november"][14] = "626";
monat["november"][15] = "641";
monat["november"][16] = "720";
monat["november"][17] = "768";
monat["november"][18] = "840";
monat["november"][19] = "882";
monat["november"][20] = "918";
monat["november"][25] = "461";
monat["november"][30] = "642";
monat["november"][41] = "814";
monat["november"][43] = "998";
monat["november"][45] = "1092";
monat["november"][46] = "1104";
monat["november"][52] = "1336";
monat["november"][53] = "1469";

monat["dezember"] = new Object();
monat["dezember"][01] = "159";
monat["dezember"][02] = "201";
monat["dezember"][03] = "212";
monat["dezember"][04] = "267";
monat["dezember"][05] = "292";
monat["dezember"][06] = "318";
monat["dezember"][07] = "339";
monat["dezember"][08] = "360";
monat["dezember"][09] = "407";
monat["dezember"][10] = "445";
monat["dezember"][11] = "467";
monat["dezember"][12] = "477";
monat["dezember"][13] = "515";
monat["dezember"][14] = "553";
monat["dezember"][15] = "566";
monat["dezember"][16] = "636";
monat["dezember"][17] = "678";
monat["dezember"][18] = "742";
monat["dezember"][19] = "779";
monat["dezember"][20] = "811";
monat["dezember"][25] = "407";
monat["dezember"][30] = "567";
monat["dezember"][41] = "719";
monat["dezember"][43] = "882";
monat["dezember"][45] = "965";
monat["dezember"][46] = "975";
monat["dezember"][52] = "1180";
monat["dezember"][53] = "1297";

var sekundenwert = monat[monatvalue][preisgruppevalue];
var preisvalue = sekundenwert * sekundenvalue;
document.getElementById("preistext").firstChild.nodeValue = "Preis:";
document.getElementById("sekundenfehler").firstChild.nodeValue = " ";
document.getElementById("preis").firstChild.nodeValue = preisvalue +" Euro";
}
}