var name = new Image(); 
name.src = "sp_2003/missing.gif";
var subject = new Image(); 
subject.src = "sp_2003/missing.gif";
var email = new Image(); 
email.src = "sp_2003/missing.gif";
var captcha = new Image(); 
captcha.src = "sp_2003/missing.gif";

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

function validateForm(f) {
haveErrors = 0;
(f.name.value.length < 1) // validate first name length
? showImage("nameerror", "sp_2003/missing.gif", true)   // no semi-colon after this line!
: showImage("nameerror", "sp_2003/spacer.gif", false); // true = errors, false = no errors

(f.subject.value.length < 1) // validate last name length
? showImage("subjecterror", "sp_2003/missing.gif", true)
: showImage("subjecterror", "sp_2003/spacer.gif", false);

(f.email.value.search("@") == -1 || f.email.value.search("[.*]") == -1) // validate email
? showImage("emailerror", "sp_2003/missing.gif", true)
: showImage("emailerror", "sp_2003/spacer.gif", false);

(f.strCAPTCHA.value.length < 1) // validate strCAPTCHA
? showImage("strCAPTCHAerror", "sp_2003/missing.gif", true)
: showImage("strCAPTCHAerror", "sp_2003/spacer.gif", false);

return (!haveErrors);
}