function set()
{
if (document.login.select.selectedIndex == "")  {
alert ("Kindly select one category.");
document.login.select.focus();
return false;
}

if (!(/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,4})+$/.test(document.login.username.value))) {
alert("Invalid Username.");
document.login.username.focus();
return (false);
}

if (document.login.password.value.length == 0)  {
alert ("password required");
document.login.password.focus();
return false;
}

return true;

}