Kode virker ikke i Netscape

Denne kode virker godt i Internet Explorer 5.x, men ikke i Netscape 4.x. Det kommer ingen fejlmeddelelser i Netscape, min html form felter opdateres ikke.
Koden blir fyret af ved hjlp av onChange(this);
(selv om jeg ikke bruger this objektet):

function get_total_points(what) {
var Cpf = 2;
var Cc = 250;
var Hpf = 2;
var Hc = 250;
var R1pf = 1;
var R1c = 150;
var R2pf = 2;
var R2c = 150;
var R3pf = 1;
var R3c = 150;
var RCpf = 2;
var RCc = 250;
var Tpf = 1;
var Tc = 250;
tasktype = document.forms[0].elements[11].value;
pointfactor = document.forms[0].elements[19].value;
if (tasktype == \'Customer\') {
    document.forms[0].elements[19].value = Cpf;
    document.forms[0].elements[20].value = document.forms[0].elements[17].value * Cpf;
    document.forms[0].elements[22].value = document.forms[0].elements[20].value * Cc;
    }
else if (tasktype == \'Helpdesk\') {
    document.forms[0].elements[19].value = Hpf;
    document.forms[0].elements[20].value = document.forms[0].elements[18].value * Hpf;
    document.forms[0].elements[22].value = document.forms[0].elements[20].value * Hc;
    }
else if (tasktype == \'Other\') {
    var Opf = prompt(\"How many points per hour ?\");
    document.forms[0].elements[19].value = Opf
    document.forms[0].elements[20].value = document.forms[0].elements[17].value * Opf;
    var cashperpoint = prompt(\"How much cash per point ?\");
    document.forms[0].elements[22].value = document.forms[0].elements[20].value * cashperpoint;
    }
else if (tasktype == \'Remote 1\') {
    document.forms[0].elements[19].value = R1pf;
    document.forms[0].elements[20].value = document.forms[0].elements[18].value * R1pf;
    document.forms[0].elements[22].value = document.forms[0].elements[20].value * R1c;
    }
else if (tasktype == \'Remote 2\') {
    document.forms[0].elements[19].value = R2pf;
    document.forms[0].elements[20].value = document.forms[0].elements[18].value * R2pf;
    document.forms[0].elements[22].value = document.forms[0].elements[20].value * R2c;
    }
else if (tasktype == \'Remote 3\') {
    document.forms[0].elements[19].value = R3pf;
    document.forms[0].elements[20].value = document.forms[0].elements[18].value * R3pf;
    document.forms[0].elements[22].value = document.forms[0].elements[20].value * R3c;
    }
else if (tasktype == \'Remote Call Recieved\') {
    document.forms[0].elements[19].value = RCpf;
    document.forms[0].elements[20].value = document.forms[0].elements[18].value * RCpf;
    document.forms[0].elements[22].value = document.forms[0].elements[20].value * RCc;
    }
else if (tasktype == \'Time off\') {
    document.forms[0].elements[19].value = Tpf;
    document.forms[0].elements[20].value = document.forms[0].elements[17].value * (- Tpf);
    document.forms[0].elements[22].value = document.forms[0].elements[20].value * Tc;
    }
}