function ESSOX_aktualizuj(typ)
{
    var o = document.getElementById('ESSOX_'+typ+'_bezurocneObdobi');
    if (o)
    {
        set_value('ESSOX_specialProduct', o[o.selectedIndex].value);
    }

    // nastavit odklad splatek!!!
    o = document.getElementById('ESSOX_'+typ+'_odkladSplatek');
    if (o)
    {
        set_value('ESSOX_odkladSplatek', o[o.selectedIndex].value);
    }

    o = document.getElementById('productID'+typ);
    if (o)
    {
        o.checked = true;
    }

    return ESSOX_splatkyJS(typ, ESSOX_get('ESSOX_' + typ + '_akontace'), ESSOX_get('ESSOX_' + typ + '_pocetSplatek'), ESSOX_get('ESSOX_' + typ + '_bezurocneObdobi'));
}

function ESSOX_get(el) {
    if(document.getElementById(el)) {
        return (document.getElementById(el).type=="select") ? document.getElementById(el).options[document.getElementById(el).selectedIndex].value : document.getElementById(el).value;
    } else return false;
}

function setContent(el,res) {
    if (document.getElementById(el).textContent) document.getElementById(el).textContent = res;
    else document.getElementById(el).innerText = res;
}

function rozdilDnu(pujcDen,pujcMes,pujcRok,splDen,splMes,splRok)
{
    /* spravne podle zakona (matematicky), ale ponekud neprehledne
    pujcDen = parseInt(pujcDen);
    pujcMes = parseInt(pujcMes);
    pujcRok = parseInt(pujcRok);
    splDen = parseInt(splDen);
    splMes = parseInt(splMes);
    splRok = parseInt(splRok);

    if (pujcMes <= 2) { pujcRok -=1; pujcMes +=12; }
    a = Math.floor( pujcRok/100 );
    b = 2 - a + Math.floor( a/4 );
    JulianDayPujcka = Math.floor( 365.25 * ( pujcRok + 4716 )) + Math.floor( 30.6001 * ( pujcMes + 1 )) + pujcDen + b;
    if (splMes <= 2) { splRok -=1; splMes +=12; }
    a = Math.floor( splRok/100 );
    b = 2 - a + Math.floor( a/4 );
    JulianDaySplatka = Math.floor( 365.25 * ( splRok + 4716 )) + Math.floor( 30.6001 * ( splMes + 1 )) + splDen + b;
    return ( JulianDaySplatka - JulianDayPujcka );
    */

    var pujc = new Date(pujcRok, pujcMes-1, pujcDen);
    var spl  = new Date(splRok, splMes-1, splDen);
    return Math.floor((spl - pujc)/86400000 + 0.5); //spl a pujc je v ms, zaokrouhleno kvuli dnum, kdy se posunuje cas
}

function fhodnota(pujcka,rok,tsplatka,tcas,sazba)
{
    soucet = 0;
    for (i=0; i<tsplatka.length; i++)
    {
        soucet += (tsplatka[i])/Math.pow((1+sazba),tcas[i]/rok);
    }
    return(soucet - pujcka);
}

function ESSOXpocitejRPSN(pocetSplatek,pujcka,splatka)
{
    rok = 365;
    pujcDen = 1;
    pujcMes = new Date(); pujcMes = parseInt(pujcMes.getMonth()+1);
    pujcRok = new Date(); pujcRok = parseInt(pujcRok.getFullYear());

    aSplatka = new Array();
    cas = new Array();
    for (i=(pujcMes+1); i<pocetSplatek+(pujcMes+1); i++)
    {
        aSplatka[(i-(pujcMes+1))] = splatka;
        splDen = 15;
        splMes = (i%12) ? i%12 : 12;
        splRok = pujcRok;
        splRok += (i>12) ? Math.floor((i-1)/12) : 0;
        cas[(i-(pujcMes+1))] = rozdilDnu(pujcDen,pujcMes,pujcRok,splDen,splMes,splRok);
    }

    rozdilstr = 0;
    odhad1 = 0;
    odhad2 = 10.001;  // i.e. predpoklada se, ze koren lezi mezi 0% a 1000%
    fhodnota1 = fhodnota(pujcka,rok,aSplatka,cas,odhad1);
    fhodnota2 = fhodnota(pujcka,rok,aSplatka,cas,odhad2);
    if (fhodnota1*fhodnota2<0)
    {
        odhadstr = (odhad1 + odhad2)/2;
        fhodnotastr = fhodnota(pujcka,rok,aSplatka,cas,odhadstr);

        do {
            if ((fhodnota1*fhodnotastr)>0) odhad1 = odhadstr;
            if ((fhodnota2*fhodnotastr)>0) odhad2 = odhadstr;
            fhodnota1 = fhodnota(pujcka,rok,aSplatka,cas,odhad1);
            fhodnota2 = fhodnota(pujcka,rok,aSplatka,cas,odhad2);
            rozdilstr = Math.abs(odhadstr - (odhad1 + odhad2)/2);
            odhadstr = (odhad1 + odhad2)/2;
            fhodnotastr = fhodnota(pujcka,rok,aSplatka,cas,odhadstr);
        }
        while (rozdilstr>0.000001);

        rpsn2 =Math.round(odhadstr*10000)/100;
    }
    else if (fhodnota1 == 0) rpsn2 = "0";
    else rpsn2 = "0";

    return rpsn2;
}

function ESSOX_splatkyJS(id,akontaceID,pocetSplatekID) {
    id = parseInt(id);
    castka = ESSOX_get('ESSOX_cena');
    chyba = "";
    eval('retVal = ESSOX_'+id+'_splatky(castka,akontaceID,pocetSplatekID)');

    if (retVal[2] < castka)
        chyba = "Maximální možná částka je " + retVal[2] + " Kč.";
    if (chyba!="")
    {
        retVal = new Array(0,0,0);
    }
    setContent('ESSOX_'+id+'_kalkulacka',(retVal[0]) ? retVal[0] +  ",- Kč/měs." : chyba);
    setContent('ESSOX_'+id+'_RPSN',(retVal[0]) ? "od " + retVal[1] +  " %" : "-");
    document.getElementById('ESSOX_tRPSN').value = retVal[1];
    document.getElementById('ESSOX_splatka').value = retVal[0];
    eval('akontace = ESSOX_'+id+'_akontace(akontaceID);');
    eval('pocetSplatek = ESSOX_'+id+'_pocetSplatek(pocetSplatekID);');
    document.getElementById('ESSOX_numberOfInstallments').value = pocetSplatek;
    document.getElementById('ESSOX_advancePercent').value = akontace;
    document.getElementById('ESSOX_predem').value = castka * 0.01 * akontace;
}

function set_zero(obj)
{
    o = document.getElementById(obj);

    if (o)
    {
        o.selectedIndex = 0;
    }
}

function set_value(obj, val)
{
    o = document.getElementById(obj);

    if (o)
    {
        o.value = val;
    }
}

function Numbers(e)
{
    e.value=e.value.replace(/[^0-9]/g, '');
    /*
    var keynum;
    var keychar;
    var numcheck;
    var retval = true;

    if(window.event) // IE
    {
        keynum = e.keyCode;
    }
    else if(e.which) // Netscape/Firefox/Opera
    {
        keynum = e.which;
    }

    if (keynum == 13 || keynum == 8 || keynum == 9 || keynum == 46
        || keynum == 37 || keynum == 38 || keynum == 39 || keynum == 40
        || (keynum >=96 && keynum <= 105)
        || e.altKey || e.ctrlKey || e.metaKey
        )
    {
        retval = true;
    }
    else
    {
        keychar = String.fromCharCode(keynum);

        numcheck = new RegExp(re);
        retval = numcheck.test(keychar);
    }
    return retval;
    */
}