<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<script type="text/javascript">
function validate() {
var username = document.getElementsByName("username")[0];
var password = document.getElementsByName("password")[0];
if (username.value.length < 4 || username.value.length > 10) {
alert("username length should between 4 to 10");
return false;
}
if (password.value.length < 4 || password.value.length > 10) {
alert("password length should between 4 to 10");
return false;
}
var sex = document.getElementsByName("sex")[0];
if (sex == "") {
aler("sex must select");
return false;
}
var textarea = document.getElementsByName("textarea")[0];
if ()