function provizija(amount)    {
    prov_suma=Math.round( (((amount)/100)*(prov))*2 )/2
    return prov_suma
}

function racunaj()    {
    amount=(document.curr.am.value)
    from_selected = document.curr.from.selectedIndex
    from = document.curr.from.options[from_selected].value
    from_type=document.curr.from_type.options[document.curr.from_type.selectedIndex].value
    to_selected = document.curr.to.selectedIndex
    to = document.curr.to.options[to_selected].value
    to_type=document.curr.to_type.options[document.curr.to_type.selectedIndex].value
    to_type=parseInt(to_type)+2
// konverzija u dinare
    if(to!='999')    {
        if(from!='978' && from!='999')
            prov=2
        else
            prov=0
        amount=amount*(rates[from][from_type]/rates['999'][0])
        amount=amount-provizija(amount)
        from='999'
    }
// kraj konverzije
    if((from!='978' && from!='999') || (to!='978' && to!='999'))
        prov=2
    else
        prov=0
    rezultat=amount*(rates[from][from_type]/rates[to][to_type])
    rezultat=rezultat-provizija(rezultat)
    rezultat=rezultat.toString(10)
    if(rezultat.indexOf('.')!=-1)    {
        tacka=rezultat.indexOf('.')+3
        rezultat=rezultat.substring(0,tacka)
    }
    document.curr.rezultat.value=rezultat
}

function change_type(type,valuta)    {
    var obj = type+'_type'
    if(rates[valuta][1]!=0 && rates[valuta][3]!=0 && valuta!='999')    {
        document.curr.elements[obj].length=2
        document.curr.elements[obj].style.width=80
        document.curr.elements[obj].options[0] = new Option('Devize','0')
        document.curr.elements[obj].options[1] = new Option('Efektiva','1')
    }
    else if(valuta=='999')    {
        document.curr.elements[obj].length=1
        document.curr.elements[obj].style.width=80
        document.curr.elements[obj].options[0] = new Option('---------','0')
    }
    else    {
        document.curr.elements[obj].length=1
        document.curr.elements[obj].style.width=80
        document.curr.elements[obj].options[0] = new Option('Devize','0')
    }
}