Multiple validation on a form using javascript

Question

Hello.
I have a form w/multiple fields. I want to validate all of these fields when user hit 'submit'. Below is my javascript, what do i have to do/change in order for this script to work in HTML DB? Please advise. Thank you very much.
-Anh
function validation(form) {
var email = form.email.value.toUpperCase();
var email_length = form.email.value.length;
if (form.email.value == "") {
alert("Error!\nAll fields must be entered.");
form.email.focus();
return false;
if (form.cost_center.value == "") {
alert("Error!\nAll fields must be entered.");
form.cost_center.focus();
return false;
if (form.cost_center.value.length < 4) {
alert("Error!\nWrong cost center, cost center has to be at least 4 digits.");
form.cost_center.focus();
return false;
if (form.email.value.length <= 11) {
alert("Error!\nInvalid email format.\nValid example: [email protected]");
form.email.focus();
form.email.select();
return false;
else {
if ((email.substring(email_length -11, email_length)) != "@ORACLE.COM") {
alert("Error!\nInvalid email format.");
form.email.focus();
form.email.select();
return false;
form.cost_center.value = form.cost_center.value.toUpperCase();
return true;

Answer 1

Have a look here: http://forums.adobe.com/thread/448695?tstart=0.
I hope it helps.
Ben