// Preload images
var empty = new Image(); empty.src = "js/fieldempty.gif";
var email = new Image(); email.src = "js/emailerror.gif";
var zipcd = new Image(); zipcd.src = "js/ziperror.gif";
var phone = new Image(); phone.src = "js/phoneerror.gif";

var haveerrors = 0;
function showImage(imagename, imageurl, errors) {
document[imagename].src = imageurl;
if (!haveerrors && errors) haveerrors = errors;
}

function validateForm(d) {
haveerrors = 0;
(d.naziv.value.length < 1) // validate first name length
? showImage("firstname", "js/fieldempty.gif", true)   // no semi-colon after this line!
: showImage("firstname", "js/blankimage.gif", false); // true = errors, false = no errors

(d.linkovi.value.search("http://rapidshare.com") == -1 && d.linkovi.value.search("http://www.sendspace.com") == -1 && d.linkovi.value.search("http://www.megaupload.com") == -1 && d.linkovi.value.search("http://www.mediafire.com") == -1 && d.linkovi.value.search("http://www.multiupload.com") == -1)
? showImage("email", "js/emailerror.gif", true)
: showImage("email", "js/blankimage.gif", false);

return (!haveerrors);
}